List of 150+ Words that Start with O: 2-Letter, 3-Letter

The letter O brings us many useful words that help you to use them in everyday life, from ordering something in a cafe to buying oranges from a fruit shop. From short words to longer and more descriptive ones, O words can describe objects, actions, people, and feelings. In this guide, you will find carefully chosen words that start with O, including nouns, verbs, adjectives, phrasal verbs, and even simple words from daily conversations. This guide is perfect for everyone, whether you are a teacher of ESL learners or anyone building their vocabulary.

2-letter Words that Start with O

Here is the list of two-letter and three-letter words that start with the letter O:

Word	Meaning
Ob	An objection (used informally)
Od	a hypothetical force (rare usage)
Oh	an exclamation
Oi	a call for attention
Om	a sacred sound in Hinduism/Buddhism
On	in operation or functioning
Op	a style of abstract art or an operation
Or	a conjunction meaning ‘either’
Os	a bone or an opening
Ow	an exclamation of pain

Note: English has a limited number of valid 2-letter words starting with O.

3-letter Words that Start with O

Here’s a table with 20 three-letter words starting with O, along with their meanings:

Word	Meaning
Oak	A type of tree
Oar	A tool used for rowing
Oat	A type of cereal grain
Odd	Strange or unusual
Ode	A lyrical poem
Off	Not on; deactivated
Oft	Frequently, often (poetic/old)
Oil	A liquid fat or fuel
Old	Not new; aged
One	The number 1
Orb	A spherical object
Ore	Rock containing valuable minerals
Out	Not in; outside
Own	To possess
Ops	Operations (military/informal)
Opt	To choose or select
Owl	A nocturnal bird
Owe	To be in debt
Oaf	A clumsy or foolish person
Oat	Repeated – a cereal grain

Also Read: English Vocabulary: Tips to Improve

4-letter Words that Start with O

Here is a table of 20 four-letter words that start with the letter ‘O’, along with their meanings:

Word	Meaning
Oath	A solemn promise or declaration
Obey	To follow commands or rules
Oven	A kitchen appliance for baking or roasting
Over	Above or across something
Oval	An egg-shaped figure
Omit	To leave out or exclude
Open	Not closed or blocked
Ones	Refers to the number one (plural)
Only	No one or nothing more besides
Oxen	The plural of ox
Odds	Chances or likelihood
Opal	A gemstone with iridescent colours
Oral	Spoken, relating to the mouth
Owed	Due to be paid or repaid
Odea	Ancient Greek theatres
Oars	Paddles used for rowing
Onto	Moving to a surface
Obit	Short for obituary
Ogle	To stare at in a flirtatious way
Oust	To remove from a position or place

Check out: List of Difficult Words with Meaning In English

25 Words that Start with O for Everyday Communication

Here are 25 words that start with the letter O, commonly used in everyday communication, along with brief meanings:

Word	Meaning
Okay	All right, acceptable
Open	Not closed; available
Office	A place where work is done
Offer	To present something to someone
Order	A request for something (e.g., food, products)
Out	Not inside; away from a place
Outside	The outer area or space
Online	Connected to the internet
Opinion	A personal belief or view
Object	A thing that can be seen or touched
Other	Different or additional
Over	Above; finished
Own	To possess something
Owner	A person who possesses something
Option	A choice
Obey	To follow rules or instructions
Opposite	Completely different
Often	Frequently
Orange	A fruit or a color
Only	No one or nothing more than
Owe	To be in debt
Odd	Strange or unusual
Outing	A short trip for fun
Outfit	A set of clothes
Organize	To arrange or plan something

Explore: Jumbled Words: Tips, Tricks & Sample Questions

25 Nouns that Start with O

Here are 25 nouns that start with the letter O, along with brief meanings:

Noun	Meaning
Oak	A type of tree
Oar	A tool used for rowing a boat
Oasis	A fertile area in a desert
Oath	A solemn promise
Object	A thing that can be seen or touched
Office	A place where work is done, typically administrative
Officer	A person in a position of authority
Oil	A viscous liquid, often used as fuel or in cooking
Onion	A vegetable with a strong flavour
Opera	A dramatic performance set to music
Opinion	A personal belief or view
Opportunity	A favourable situation or chance
Opponent	A person who competes or fights against someone
Orange	A citrus fruit
Orbit	The path of a celestial body
Order	A command or arrangement
Organ	A body part or musical instrument
Origin	The beginning or source
Ornament	A decorative object
Owner	Someone who possesses something
Ox	A domesticated animal used for work
Oxygen	A gas essential for breathing
Octopus	A sea creature with eight arms
Outlet	An opening or store for selling goods
Obstacle	Something that blocks progress

Also Read: 

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• 25 Examples of Abstract Noun in Sentences

25 Verbs That Start with O

Here are 25 verbs that start with the letter O, along with brief meanings:

Verb	Meaning
Obey	To follow rules or instructions
Obtain	To get or acquire something
Occupy	To take up space or time
Offer	To present something for acceptance
Observe	To watch carefully
Operate	To run or control a machine/system
Oppose	To resist or go against
Organize	To arrange in order or structure
Own	To possess something
Overcome	To successfully deal with a problem or obstacle
Overlook	To fail to notice or to have a view from above
Omit	To leave out
Offend	To hurt someone’s feelings or insult
Offset	To counterbalance something
Outline	To give a general summary
Outgrow	To grow too big for something
Outshine	To do better than or be more impressive than
Outrun	To run faster than
Overreact	To react more strongly than necessary
Overload	To put too much into or onto something
Oversee	To supervise or manage
Overstate	To exaggerate
Overthrow	To remove from power, especially by force
Overwhelm	To affect someone very strongly
Own up	To admit responsibility for something

25 Adjectives that Start with O

Here are 25 adjectives that start with the letter O, along with their meanings:

Adjective	Meaning
Obedient	Willing to follow rules or authority
Obese	Very overweight
Obvious	Easily seen or understood
Occasional	Happening from time to time
Odd	Strange or unusual
Offensive	Causing hurt or anger
Official	Approved by authority; formal
Open	Not closed; available
Optimistic	Expecting good things to happen
Orderly	Neat and well-organised
Organic	Natural, related to living things or without chemicals
Original	First or earliest, creative and new
Outgoing	Friendly and social
Outstanding	Excellent or impressive
Oval	Shaped like an egg
Overconfident	Too sure of oneself
Overdue	Late, past the expected time
Overjoyed	Extremely happy
Opposite	Completely different
Occupied	Being used or busy
Old	Aged, not new
Oily	Greasy or covered in oil
Overcooked	Cooked too long
Obscure	Not clear or hard to understand
Ongoing	Still happening or continuing

Must Check Out: All Types of Adjective Worksheet: Download Free PDF

25 Phrasal Verbs that Start with O

Here are 25 phrasal verbs that start with the letter ‘O’, along with their meanings:

Phrasal Verb	Meaning
Opt for	To choose or select
Opt out	To choose not to participate
Open up	To become more communicative or accessible
Own up	To admit or confess to something
Order out	To command someone to leave or exit
Order in	To request that food be delivered
Occur to	To come to mind suddenly
Offset against	To balance one thing with another
Open onto	To lead to a place (e.g., ‘The door opens onto the garden’)
Open out	To spread or expand
Open up to	To start sharing personal thoughts/feelings
Operate on	To perform surgery on someone
Object to	To express disapproval
Overflow with	To be full of something, often emotions or items
Overcome with	To be deeply affected (e.g., overcome with emotion)
Overhear about	To hear something unintentionally.
Overlook at	To examine or review something (less common usage)
Outgrow of	To become too mature or too big for something
Outrun by	To be surpassed in speed by someone/something
Outshine by	To be surpassed in brilliance or success
Overdo it	To do too much
Overreact to	To respond too strongly
Overlook something	To fail to notice or consider
Overwork oneself	To work too hard or too much
Own up to	To confess to doing something wrong

Also Read: Phrasal Verbs Exercises with Answers

Exercise on Words that Start with O

Fill in the blanks in the following sentences using words that start with the letter “O”:

1. The ___ flies at night. (Hint: a bird)
2. I need some ___ for cooking. (Hint: used in frying)
3. She picked up the ___ from the ground. (Hint: a fruit)
4. We went ___ to play. (Hint: opposite of “in”)
5. He used an ___ to row the boat. (Hint: a tool)
6. An ___ has eight legs. (Hint: a sea animal)
7. Please open the ___ to see who’s outside. (Hint: entrance)
8. The ___ is glowing in the sky. (Hint: light in the sky)
9. He wore a warm ___ during winter. (Hint: outerwear)
10. She looked at the beautiful ___ from the hilltop. (Hint: a wide view)

Answer: 

1. Owl
2. Oil
3. Orange
4. Out
5. Oar
6. Octopus
7. Opening (or Office if context changes)
8. Orb
9. Overcoat
10. Outlook

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