In this article, you’ll find a comprehensive list of words that start with “op,” helping you to expand your vocabulary and language skills.
- Opaque- Not able to be seen through; not transparent.
- Opal- A gemstone of hydrated silica with iridescent colors.
- Opine- To express an opinion.
- Operate- To control the functioning of a machine or device.
- Opportunity- A set of circumstances that makes it possible to do something.
- Opponent- Someone who competes or argues against another.
- Oppose- To resist or try to stop something.
- Oppression- The exercise of authority or power in a burdensome manner.
- Optimum- The most favorable conditions or level for growth, reproduction, or success.
- Option- A choice or alternative.
- Optional- Left to personal choice; not mandatory.
- Optimize- To make the best or most effective use of a situation or resource.
- Optimism- Hopefulness and confidence about the future.
- Optimal- Best or most favorable.
- Opulence- Great wealth or luxuriousness.
- Operator- A person who operates equipment or a system.
- Opposition- Resistance or dissent.
- Opulent- Ostentatiously rich and luxurious.
- Opioid- A compound resembling opium in addictive properties or physiological effects.
- Opiate- A drug derived from opium.
- Opportune- Well-timed; occurring at an advantageous time.
- Oppressive- Unjustly inflicting hardship and constraint.
- Opprobrium- Harsh criticism or censure.
- Oppugn- To oppose or call into question.
- Optimality- The state of being best or most effective.
- Optic- Relating to vision or the eyes.
- Operant- Involving or relating to the conditioning of behavior.
- Operose- Involving hard work; laborious.
- Opt- out – A decision to withdraw from something.
- Optical- Relating to sight or the science of optics.
- Opazon- An ancient Greek weapon; a sword.
- Opacarophile- One who loves sunsets.
- Operculum- A bony or cartilaginous covering in fish and some mollusks.
- Opsimath- A person who begins to learn or study only late in life.
- Opisometer- An instrument for measuring curved lines.
- Optometry- The practice or profession of examining the eyes.
- Optical- Related to or using light.
- Oplate- Obsolete term for a feast or banquet.
- Openwork- Ornamentally perforated work in metal or other material.
- Optician- A person qualified to make and supply eyeglasses and contact lenses.
- Operability- The capability of being operated.
- Ophidian- Relating to or resembling snakes.
- Opus- A separate composition or set of compositions by a particular composer.
- Operetta- A short opera, usually on a light or humorous theme.
- Oppilation- Obstruction or constipation.
- Ophthalmic- Related to the eyes.
- Ophthalmology- The branch of medicine concerned with the eyes.
- Ophiolite- A section of the Earth’s oceanic crust and underlying upper mantle.
- Oppugnancy- The act of resisting or opposing.
- Opulence- Great wealth and luxury.
- Opisthograph- A manuscript or piece of writing having text on both sides of the page.
- Oppidan- Of or relating to a town.
- Operation- The fact or condition of functioning or being active.
- Operability- Capability of being performed or operated.
- Ophiolatry- The worship of snakes.
- Operative- Functioning; having effect.
- Opalescent- Showing varying colors as an opal does.
- Opioid- A compound resembling opium in addictive properties or physiological effects.
- Opiatic- Relating to or resembling opium.
- Ophiophagous- Feeding on snakes.
- Opthalmometer- An instrument for measuring the curvature of the cornea.
- Opercle- Another term for operculum.
- Optant- One who makes a choice or selection.
- Opsonin- A substance that promotes the phagocytosis of bacteria.
- Opporobious- Bringing disgrace or shame.
- Optoelectronics- The study and application of electronic devices that source, detect, and control light.
- Oplotheism- The worship of weapons.
- Opisthocomous- Relating to the hoatzin, a tropical bird.
- Optical- Related to sight or optics.
- Oplogy- The study of arms or weapons.
- Ophrys- A type of orchid.
- Oppositionist- Someone who supports opposition, especially in politics.
- Optative- Expressing a wish or hope.
- Opiniaster- Firmly adhering to one’s own opinion; opinionated.
- Opaque- Not allowing light to pass through.
- Opague- Rare, another spelling for opaque.