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You are here: Home / Vocabulary / 100 One-Word Substitutions Everyone Should Know

100 One-Word Substitutions Everyone Should Know

August 11, 2025 - pdf

No. Term Definition
1. Autobiography A life story written by oneself.
2. Biography A life story written by another person.
3. Atheist A person who does not believe in God.
4. Monotheist A person who believes in one God.
5. Polytheist A person who believes in many gods.
6. Democracy A government run by the people.
7. Monarchy A government run by a king or queen.
8. Anarchy The complete absence of government.
9. Aviary A place where birds are kept.
10. Apiary A place where bees are kept.
11. Aquarium A tank for keeping fish and water plants.
12. Omnipotent Having unlimited power.
13. Omnipresent Being present everywhere at once.
14. Omniscient Having complete or unlimited knowledge.
15. Bilingual Able to speak two languages fluently.
16. Polyglot Able to speak several languages.
17. Invincible Incapable of being defeated.
18. Illegible A handwriting that is impossible to read.
19. Inexplicable Impossible to explain or understand.
20. Unavoidable Impossible to avoid or prevent.
21. Inevitable Something that is certain to happen.
22. Incorrigible A person impossible to correct or reform.
23. Philanthropist One who gives money to help the needy.
24. Misanthrope A person who dislikes other people.
25. Optimist One who is hopeful about the future.
26. Pessimist One who sees the worst in things.
27. Novice A person new to a profession or skill.
28. Veteran A person with long experience in a field.
29. Extempore A speech made without preparation.
30. Panacea A cure for all diseases or problems.
31. Inaudible A sound that cannot be heard.
32. Arsenal A place for storing military weapons.
33. Hangar A large building for housing aircraft.
34. Abdicate To formally give up the throne.
35. Stoic A person who endures pain without complaint.
36. Gourmet A lover of fine food and drink.
37. Diurnal Active or occurring during the day.
38. Nocturnal Active or occurring at night.
39. Manuscript A text written by hand.
40. Amphibian An animal living both on land and in water.
41. Contemporary A person living in the same time period.
42. Orphan A child whose parents have died.
43. Fragile Something easily broken or damaged.
44. Opaque Not able to be seen through.
45. Catalogue A systematic list of items.
46. Etymology The study of the origin of words.
47. Astronomy The scientific study of stars and planets.
48. Homicide The killing of another person.
49. Matricide The killing of one’s own mother.
50. Patricide The killing of one’s own father.
51. Regicide The killing of a king.
52. Suicide The act of taking one’s own life.
53. Pilgrim A person traveling to a sacred place.
54. Glutton One who eats and drinks excessively.
55. Insolvent A person unable to pay their debts.
56. Calligraphy The art of beautiful handwriting.
57. Obsolete No longer in use; out of date.
58. Arbitrator A neutral person who settles a dispute.
59. Flammable Something that catches fire easily.
60. Mercenary One who does anything for money.
61. Acrophobia An extreme fear of heights.
62. Claustrophobia An extreme fear of confined places.
63. Aquaphobia An extreme fear of water.
64. Epitaph Words inscribed on a tombstone.
65. Emigrant One who leaves a country to settle in another.
66. Immigrant One who settles in a new country.
67. Credible Able to be believed or trusted.
68. Incredible Something difficult or impossible to believe.
69. Oxymoron A figure of speech with contradictory terms.
70. Posthumous Occurring or awarded after one’s death.
71. Sanatorium A place for long-term medical recovery.
72. Dormitory A large bedroom for many people.
73. Archive A collection of historical records.
74. Endemic A plant or animal native to one area.
75. Plagiarize To steal and pass off ideas as one’s own.
76. Polyandry The practice of a woman having multiple husbands.
77. Polygyny The practice of a man having multiple wives.
78. Monogamy The practice of having only one spouse.
79. Fastidious A person very attentive to detail.
80. Eligible Suitable or qualified to be chosen.
81. Ephemeral Lasting for a very short time.
82. Perennial Lasting for a very long or infinite time.
83. Somnambulist A person who walks in their sleep.
84. Somniloquist A person who talks in their sleep.
85. Seismology The scientific study of earthquakes.
86. Psychology The scientific study of the human mind.
87. Cartographer A person who designs and draws maps.
88. Pandemic A disease that spreads worldwide.
89. Irrevocable A decision that cannot be changed.
90. Excursion A short journey or trip for pleasure.
91. Cannibal A person who eats human flesh.
92. Ambiguous A statement with multiple meanings.
93. Portable Something that can be carried easily.
94. Abode A place where one lives or resides.
95. Illegal That which is against the law.
96. Apprentice A person learning a skill under a master.
97. Ubiquitous Something existing or found everywhere.
98. Advocate A person who publicly supports an idea.
99. Soluble Able to be dissolved in a liquid.
100. Transparent Allowing light to pass through so objects behind can be seen clearly.
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