Nouns That Start With O

Are you a word enthusiast or looking to expand your vocabulary? You’re in the right place! We’ve curated a list of nouns that start with O that is sure to pique your interest!  


Common Nouns That Start With O

Photo showing common O nouns

There are so many interesting nouns that start with O. Let’s take a look at some of our favorite common O nouns:

  • Odor: Have you ever walked into a restaurant and been greeted by great-smelling food? That smell making your taste buds tingle can also be considered an odor.
  • Oxygen: A major component of human survival is oxygen. It’s what we breathe, and it’s also a major element in the Earth’s atmosphere. 
  • Omelet: One of the most classic breakfast foods might be the omelet. It’s the result of beating eggs and adding ingredients of your liking before folding it in half.
  • Offense: If you have gotten upset or felt insulted by something someone said, you took offense. Offense is also used in sports when referring to the members of a team whose purpose is to score points against the other team.  
  • Ocean: Covering a significant portion of Earth, oceans are vast bodies of water.
  • Oatmeal: Another excellent breakfast choice, oatmeal is a delightful dish made from ground oats. Oatmeal is typically served warm and can be topped with whatever you desire!
  • Offspring: If you have children, then you have offspring. You are your parent’s offspring! 
  • Obstacle: When you are working towards a goal and there is something in your way of reaching that goal, whatever is in your way is an obstacle.  
  • OversightThe purpose of editing your work is to make sure you didn’t miss anything. When something is missed, it is called an oversight.  
  • OutfitYou may have picked out a particular set of clothes to wear for an event. You would call that set of clothes an outfit. 
  • Orchestra: Have you ever listened to live classical music? It’s possible that it was played by an orchestra, which is a group of musicians playing a variety of instruments together. 
  • Oscillation: Swings have oscillation. As the swing moves from its resting point, it must then return to its resting point. This is called oscillation.  
  • Outcast: Have you been with a group of people that you didn’t feel you belonged with? If so, then you might consider yourself an outcast. 

Positive Nouns That Start With O

Photo showing several positive O nouns

Continuing our journey of exploring nouns that start with O, let’s take a look at some positive O nouns:

  • OasisMany places in this world could be considered an oasis. An oasis is a place to relax and get away from the hustle and bustle of life. 
  • Odyssey: If you have been on a long journey or adventure, then you could also consider that an odyssey!
  • Ornament: Do you decorate your Christmas tree? If so, chances are that you hang ornaments. Ornaments can be any decoration meant to enhance the appearance of something. 
  • Obligation: You might have an obligation to obey the speed limit or feed your children. An obligation is something that is required of you.
  • Orientation: If you are hired by an employer, there is a good chance that you will go through orientation. It’s essentially the process of aligning you with the business. 
  • Official: Chances are that you’ve seen members of the government speak on television. These individuals would be considered officials of the government. 
  • Obedience: If you have a dog that sits when you tell them to, then your dog has some obedience since they do what you tell them to. 
  • Optimism: Do you ever feel like good things are coming your way? If so, then you have optimism. 
  • Occupation: The work you do for a living is your occupation. 
  • Ordinance: Some neighborhoods have noise ordinances; this means that a rule exists that prohibits loud noise after a certain time of night.
  • Optimum: Have you ever mixed together spices while cooking until you can say that it tastes perfect? You could also say that the spice mix is optimum. 
  • Outlook: We all know someone who is always positive about things in life. We would say that this person has a positive outlook.  
  • Originality: If anyone has called you unique, then you have originality because something about you is not the same as everyone else.
  • Opportunity: Every time that you have a chance to win a game, you have the opportunity to win the game.

Full List of Nouns That Start With O

  • Oasis
  • Odyssey 
  • Ornament 
  • Obligation 
  • Orientation 
  • Official
  • Obedience 
  • Optimism 
  • Occupation 
  • Ordinance 
  • Optimum
  • Outlook 
  • Originality
  • Opportunity
  • Odor 
  • Oxygen 
  • Omelet
  • Offense 
  • Ocean 
  • Oatmeal 
  • Offspring 
  • Obstacle 
  • Oversight 
  • Outfit 
  • Orchestra 
  • Oscillation 
  • Outcast
  • Ointment
  • Onions
  • Orange 
  • Oven 
  • Oath 
  • Octopus 
  • Oyster
  • Ostrich 
  • Owl 
  • Ovation 
  • Overflow 
  • Obesity 
  • Oak
  • Otter 
  • Orbit 
  • Orb 
  • Oral
  • Ogres
  • Octagon 
  • Overseer
  • Oration
  • Ode 
  • Ozone 
  • Opal 
  • Oblong 
  • Opera 
  • Oomph 
  • Overcoat
  • Overpopulation 
  • Ounce 
  • Onset 
  • Outreach 
  • Outlaw 
  • Orchid 
  • Onyx 
  • Orca
  • Oxen 
  • Ooze 
  • Obelisk 
  • Orchestration
  • Oafs 
  • Overestimation 
  • Obliteration 
  • Overprotection 
  • Omega 
  • Oodles
  • Office 
  • Onion
  • Orchard 
  • Order
  • Organization
Photo showing a list of nouns that start with O.

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