π 200 Exam-Based Singular–Plural Words
A. Internal Vowel Change
1. Man → Men
2. Woman → Women
3. Tooth → Teeth
4. Foot → Feet
5. Goose → Geese
6. Mouse → Mice
7. Louse → Lice
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B. Same in Singular & Plural
8. Sheep → Sheep
9. Deer → Deer
10. Fish → Fish (but fishes = different species)
11. Aircraft → Aircraft
12. Species → Species
13. Series → Series
14. Salmon → Salmon
15. Swine → Swine
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C. -f / -fe → -ves
16. Leaf → Leaves
17. Knife → Knives
18. Wife → Wives
19. Wolf → Wolves
20. Life → Lives
21. Calf → Calves
22. Half → Halves
23. Loaf → Loaves
24. Thief → Thieves
25. Shelf → Shelves
⚠️ Exception: belief → beliefs, roof → roofs
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D. -o Ending (mixed)
26. Hero → Heroes
27. Potato → Potatoes
28. Tomato → Tomatoes
29. Echo → Echoes
30. Veto → Vetoes
31. Mango → Mangoes
32. Piano → Pianos
33. Photo → Photos
34. Dynamo → Dynamos
35. Solo → Solos
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E. Latin / Greek Origin (scholarly words)
36. Alumnus → Alumni
37. Alumna → Alumnae
38. Medium → Media
39. Memorandum → Memoranda
40. Bacterium → Bacteria
41. Datum → Data
42. Curriculum → Curricula
43. Formula → Formulae / Formulas
44. Radius → Radii
45. Stimulus → Stimuli
46. Terminus → Termini
47. Syllabus → Syllabi / Syllabuses
48. Nucleus → Nuclei
49. Fungus → Fungi
50. Focus → Foci / Focuses
51. Index → Indices / Indexes
52. Appendix → Appendices / Appendixes
53. Matrix → Matrices
54. Vertex → Vertices
55. Vortex → Vortices
56. Axis → Axes
57. Crisis → Crises
58. Thesis → Theses
59. Hypothesis → Hypotheses
60. Analysis → Analyses
61. Diagnosis → Diagnoses
62. Oasis → Oases
63. Basis → Bases
64. Phenomenon → Phenomena
65. Criterion → Criteria
66. Automaton → Automata
67. Gymnasium → Gymnasia
68. Symposium → Symposia
69. Erratum → Errata
70. Stratum → Strata
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F. Double Plurals (different meanings)
71. Genius → Geniuses (talented people) / Genii (guardian spirits)
72. Index → Indexes (books) / Indices (math, science)
73. Formula → Formulas (ordinary) / Formulae (scientific)
74. Medium → Mediums (fortune tellers) / Media (mass communication)
75. Appendix → Appendixes (books) / Appendices (anatomy, technical)
76. Fish → Fish (uncountable) / Fishes (varieties)
77. Cloth → Cloths (fabric) / Clothes (garments)
78. Die → Dice (gaming) / Dies (machines)
79. Penny → Pennies (coins) / Pence (currency)
80. Brother → Brothers (family) / Brethren (religious group)
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G. Old English/Archaic Forms
81. Child → Children
82. Ox → Oxen
83. Cow → Kine (archaic, rare)
84. Brother → Brethren (archaic plural)
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H. Foreign Words (still irregular in English)
85. Cactus → Cacti / Cactuses
86. Fungus → Fungi / Funguses
87. Larva → Larvae
88. Vertebra → Vertebrae
89. Formula → Formulae
90. Papyrus → Papyri
91. Stigma → Stigmata
92. Schema → Schemata
93. Antenna → Antennae / Antennas
94. Arena → Arenae
95. Nebula → Nebulae
96. Diploma → Diplomas / Diplomata
97. Encyclopedia → Encyclopaediae (rare, old use)
98. Arcanum → Arcana
99. Encomium → Encomia
100. Millennium → Millennia
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I. Compound Nouns
101. Passer-by → Passers-by
102. Father-in-law → Fathers-in-law
103. Commander-in-chief → Commanders-in-chief
104. Man-of-war → Men-of-war
105. Son-in-law → Sons-in-law
106. Daughter-in-law → Daughters-in-law
107. Step-son → Step-sons
108. Maid-servant → Maid-servants
109. Man-servant → Men-servants
110. Woman-doctor → Women-doctors
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J. Miscellaneous Irregulars
111. Person → People (but persons in legal use)
112. Footman → Footmen
113. Workman → Workmen
114. Policeman → Policemen
115. Gentleman → Gentlemen
116. Scotsman → Scotsmen
117. Irishman → Irishmen
118. Frenchman → Frenchmen
119. Englishman → Englishmen
120. Huntsman → Huntsmen
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K. Rare/Exam Favorites
121. Cherub → Cherubim / Cherubs
122. Seraph → Seraphim / Seraphs
123. Calx → Calces
124. Corpus → Corpora
125. Opus → Opera
126. Lexis → Lexes
127. Chassis → Chassis
128. Bison → Bison
129. Moose → Moose
130. Grouse → Grouse
131. Swine → Swine
132. Yoke → Yoke
133. Gallows → Gallows
134. Premises → Premises (always plural)
135. Riches → Riches (plural only)
136. Scissors → Scissors (plural only)
137. Tongs → Tongs (plural only)
138. Spectacles → Spectacles (plural only)
139. Tidings → Tidings
140. Wages → Wages
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L. Special Latin Plurals (High-Level)
141. Addendum → Addenda
142. Agenda → Agenda (plural in origin but used singular now)
143. Emendation → Emendanda
144. Memorandum → Memoranda
145. Referendum → Referenda
146. Stadium → Stadia / Stadiums
147. Theorem → Theorems
148. Curriculum vitae → Curricula vitae
149. Agendum → Agenda
150. Libretto → Libretti
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M. Advanced Greek Words
151. Stigma → Stigmata
152. Dogma → Dogmata / Dogmas
153. Drama → Dramas / Dramata
154. Rhetor → Rhetors
155. Lexicon → Lexica / Lexicons
156. Cyclops → Cyclopes
157. Polyp → Polyps / Polypi
158. Trochus → Trochi
159. Platypus → Platypuses / Platypi
160. Octopus → Octopuses / Octopodes
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N. Words with Dual Forms (Both Correct)
161. Stadium → Stadiums / Stadia
162. Syllabus → Syllabuses / Syllabi
163. Index → Indexes / Indices
164. Formula → Formulas / Formulae
165. Curriculum → Curriculums / Curricula
166. Medium → Mediums / Media
167. Appendix → Appendixes / Appendices
168. Phenomenon → Phenomena
169. Memorandum → Memoranda / Memorandums
170. Datum → Data
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O. Odd Plurals (Special)
171. Louse → Lice
172. House → Houses
173. Mouse → Mice
174. Dice → Dice
175. Goose → Geese
176. Manservant → Menservants
177. Stepchild → Stepchildren
178. Countryman → Countrymen
179. Gentleman → Gentlemen
180. Salesman → Salesmen
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P. Plurals with Different Meanings
181. Cloth → Cloths (fabric) / Clothes (garments)
182. Custom → Customs (duties)
183. Moral → Morals (ethics)
184. Force → Forces (army)
185. Work → Works (factory/literary works)
186. Colour → Colours (flag, emblem)
187. Quarter → Quarters (lodging)
188. Good → Goods (property)
189. Iron → Irons (fetters)
190. Letter → Letters (literature)
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Q. Higher-Level / Rare Plurals
191. Alga → Algae
192. Larva → Larvae
193. Antithesis → Antitheses
194. Paradox → Paradoxes
195. Axis → Axes
196. Ellipsis → Ellipses
197. Parenthesis → Parentheses
198. Synopsis → Synopses
199. Oasis → Oases
200. Thesis → Theses
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