Words That Start With Op: A Detailed List

In this article, you’ll find a comprehensive list of words that start with “op,” helping you to expand your vocabulary and language skills.

  1. Opaque- Not able to be seen through; not transparent.
  2. Opal- A gemstone of hydrated silica with iridescent colors.
  3. Opine- To express an opinion.
  4. Operate- To control the functioning of a machine or device.
  5. Opportunity- A set of circumstances that makes it possible to do something.
  6. Opponent- Someone who competes or argues against another.
  7. Oppose- To resist or try to stop something.
  8. Oppression- The exercise of authority or power in a burdensome manner.
  9. Optimum- The most favorable conditions or level for growth, reproduction, or success.
  10. Option- A choice or alternative.
  11. Optional- Left to personal choice; not mandatory.
  12. Optimize- To make the best or most effective use of a situation or resource.
  13. Optimism- Hopefulness and confidence about the future.
  14. Optimal- Best or most favorable.
  15. Opulence- Great wealth or luxuriousness.
  16. Operator- A person who operates equipment or a system.
  17. Opposition- Resistance or dissent.
  18. Opulent- Ostentatiously rich and luxurious.
  19. Opioid- A compound resembling opium in addictive properties or physiological effects.
  20. Opiate- A drug derived from opium.
  21. Opportune- Well-timed; occurring at an advantageous time.
  22. Oppressive- Unjustly inflicting hardship and constraint.
  23. Opprobrium- Harsh criticism or censure.
  24. Oppugn- To oppose or call into question.
  25. Optimality- The state of being best or most effective.
  26. Optic- Relating to vision or the eyes.
  27. Operant- Involving or relating to the conditioning of behavior.
  28. Operose- Involving hard work; laborious.
  29. Opt- out – A decision to withdraw from something.
  30. Optical- Relating to sight or the science of optics.
  31. Opazon- An ancient Greek weapon; a sword.
  32. Opacarophile- One who loves sunsets.
  33. Operculum- A bony or cartilaginous covering in fish and some mollusks.
  34. Opsimath- A person who begins to learn or study only late in life.
  35. Opisometer- An instrument for measuring curved lines.
  36. Optometry- The practice or profession of examining the eyes.
  37. Optical- Related to or using light.
  38. Oplate- Obsolete term for a feast or banquet.
  39. Openwork- Ornamentally perforated work in metal or other material.
  40. Optician- A person qualified to make and supply eyeglasses and contact lenses.
  41. Operability- The capability of being operated.
  42. Ophidian- Relating to or resembling snakes.
  43. Opus- A separate composition or set of compositions by a particular composer.
  44. Operetta- A short opera, usually on a light or humorous theme.
  45. Oppilation- Obstruction or constipation.
  46. Ophthalmic- Related to the eyes.
  47. Ophthalmology- The branch of medicine concerned with the eyes.
  48. Ophiolite- A section of the Earth’s oceanic crust and underlying upper mantle.
  49. Oppugnancy- The act of resisting or opposing.
  50. Opulence- Great wealth and luxury.
  51. Opisthograph- A manuscript or piece of writing having text on both sides of the page.
  52. Oppidan- Of or relating to a town.
  53. Operation- The fact or condition of functioning or being active.
  54. Operability- Capability of being performed or operated.
  55. Ophiolatry- The worship of snakes.
  56. Operative- Functioning; having effect.
  57. Opalescent- Showing varying colors as an opal does.
  58. Opioid- A compound resembling opium in addictive properties or physiological effects.
  59. Opiatic- Relating to or resembling opium.
  60. Ophiophagous- Feeding on snakes.
  61. Opthalmometer- An instrument for measuring the curvature of the cornea.
  62. Opercle- Another term for operculum.
  63. Optant- One who makes a choice or selection.
  64. Opsonin- A substance that promotes the phagocytosis of bacteria.
  65. Opporobious- Bringing disgrace or shame.
  66. Optoelectronics- The study and application of electronic devices that source, detect, and control light.
  67. Oplotheism- The worship of weapons.
  68. Opisthocomous- Relating to the hoatzin, a tropical bird.
  69. Optical- Related to sight or optics.
  70. Oplogy- The study of arms or weapons.
  71. Ophrys- A type of orchid.
  72. Oppositionist- Someone who supports opposition, especially in politics.
  73. Optative- Expressing a wish or hope.
  74. Opiniaster- Firmly adhering to one’s own opinion; opinionated.
  75. Opaque- Not allowing light to pass through.
  76. Opague- Rare, another spelling for opaque.

More words: