Nouns that start with O

Noun

Definition + Plural Form(s)

Example Sentence

Oath

a sincere pledge to tell the truth or follow through on your commitments

PLURAL: Oaths

The Constitution is an oath to be upheld by presidents.

Oatmeal

oat flour is used to make oat cakes or porridge

PLURAL: Oatmeals

I ate oatmeal again for the fourth day.

Oaf

a gruff, clumsy, and ignorant man

PLURAL: Oafs

They are only large, awkward oafs.

Oasis

Is a desert oasis with water that is fertile

PLURAL: Oases

At an oasis, they made their overnight stop.

Object

Is a visible or touchable object that isn’t typically a live item like a plant, animal, or person

PLURAL: Objects

Any object that newborn touch will instantly cause its fingers to wrap around it.

Observation

Of being aware of something or someone

PLURAL: Observations

An observation is being conducted by the police on the suspect.

Occasion

Is a specific moment, mainly when something occurs or has already occurred

PLURAL: Occasions

We had multiple occasion to talk about the problem.

Occupation

a profession or job

PLURAL: Occupation

Please provide your name, age, and occupation.

Odor

Is a specific smell, especially an unpleasant one

PLURAL: Odors

The odor she had earlier detected lingered in the air.

Odyssey

Is a protracted wandering or journey, typically characterized by many changes of luck

PLURAL: Odysseys

They left Texas and embarked on a three-year odyssey that eventually brought them to Japan.

Office

Is a space, group of spaces, or structure used for business, professional, or administrative purposes

PLURAL: Offices

Last night, I didn’t leave the office until eight o’clock.

Offer

an indication of willingness to provide or do anything upon request

PLURAL: Offers

I’ll accept your offer one day.

Ogre

Is a person who is fearsome and fierce

PLURAL: Ogres

Some of my professors truly resembled ogres.

Oil

Is a petroleum-based viscous liquid, particularly one used as a fuel or lubricant

PLURAL: Oils

Oil and water don’t mix.

Omelet

Is a fried egg dish that can be served simply or with a savory or sweet topping or filling.

PLURAL: Omelets

Please serve me an omelet with cheese on the side.

Omen

Is something that is believed to be an indicator of the timing of an event

PLURAL: Omens

A broken mirror is frequently interpreted as an omen of bad luck.

Onion

Is a vegetable that is a swelling edible bulb made up of numerous concentric layers

PLURAL: Onions

To lightly color the onion, cook it in oil.

Oomph

Is the property of being thrilling, lively, or seductive

PLURAL: Oomphs

You should give your acting more oomph.

Option

one thing that can be selected from a variety of options

PLURAL: Options

The wisest course option would be to postpone the trip entirely.

Orange

delicious fruit that is surrounded by a thick orange peel and a split orange center

PLURAL: Oranges

In oranges and other citrus fruit, you can find vitamin C.

Origin

the starting point or location of something

PLURAL: Origins

 The origin of life is a subject of numerous ideas.

Ounce

a little quantity of something

PLURAL: Ounces

Robyn gathered up every ounce strength.

Outside

externally or on one side of something

PLURAL: Outsides

The house needs to have its outside painted.

Oven

Is an enclosed space used to cook and heat food that is typically a component of a cooker.

PLURAL: Ovens

The cake in the oven was utterly forgotten by her.

Oxygen

Is an odorless, colorless reactive gas that is necessary for life to exist in the atmosphere.

PLURAL: Oxygens

Nowadays, the oxygen demand is increasing due to Covid-19.