| No. | Item | Definition |
|---|---|---|
| 1. | addendum | plural: addenda or addendums |
| 2. | agendum | plural: agenda |
| 3. | alga | plural: algae |
| 4. | alumnus | plural: alumni |
| 5. | analysis | plural: analyses |
| 6. | appendix | plural: appendixes or appendices |
| 7. | automaton | plural: automata |
| 8. | axis | plural: axes |
| 9. | bacillus | plural: bacilli |
| 10. | bacterium | plural: bacteria |
| 11. | basis | plural: bases |
| 12. | beau | plural: beaux or beaus |
| 13. | brother | plural: brothers or brethren |
| 14. | bureau | plural: bureaus or bureaux |
| 15. | businessman | plural: businessmen |
| 16. | businesswoman | plural: businesswomen |
| 17. | cactus | plural: cacti or cactuses |
| 18. | child | plural: children |
| 19. | consortium | plural: consortia or consortiums |
| 20. | corpus | plural: corpora or corpuses |
| 21. | cow | plural: cows or kine |
| 22. | crisis | plural: crises |
| 23. | criterion | plural: criteria |
| 24. | curriculum | plural: curricula or curriculums |
| 25. | datum | plural: data |
| 26. | diagnosis | plural: diagnoses |
| 27. | die | plural: dice |
| 28. | dogma | plural: dogmas or dogmata |
| 29. | ellipsis | plural: ellipses |
| 30. | emphasis | plural: emphases |
| 31. | Englishman | plural: Englishmen |
| 32. | erratum | plural: errata |
| 33. | father-in-law | plural: fathers-in-law |
| 34. | fireman | plural: firemen |
| 35. | focus | plural: foci or focuses |
| 36. | foot | plural: feet |
| 37. | formula | plural: formulas or formulae |
| 38. | Frenchman | plural: Frenchmen |
| 39. | fungus | plural: fungi or funguses |
| 40. | ganglion | plural: ganglia or ganglions |
| 41. | gateau | plural: gateaux or gateaus |
| 42. | genius | plural: geniuses or genii |
| 43. | gentleman | plural: gentlemen |
| 44. | genus | plural: genera |
| 45. | goose | plural: geese |
| 46. | hanger-on | plural: hangers-on |
| 47. | heir apparent | plural: heirs apparent |
| 48. | hippopotamus | plural: hippopotamuses or hippopotami |
| 49. | hypothesis | plural: hypotheses |
| 50. | index | plural: indexes or indices |
| 51. | larva | plural: larvae |
| 52. | lemma | plural: lemmas or lemmata |
| 53. | louse | plural: lice |
| 54. | man | plural: men |
| 55. | manservant | plural: menservants |
| 56. | matrix | plural: matrixes or matrices |
| 57. | medium | plural: media or mediums |
| 58. | memorandum | plural: memoranda or memorandums |
| 59. | millennium | plural: millennia or millenniums |
| 60. | mother-in-law | plural: mothers-in-law |
| 61. | mouse | plural: mice |
| 62. | nebula | plural: nebulae or nebulas |
| 63. | neurosis | plural: neuroses |
| 64. | notary public | plural: notaries public |
| 65. | nucleus | plural: nuclei |
| 66. | oasis | plural: oases |
| 67. | ovum | plural: ova |
| 68. | ox | plural: oxen |
| 69. | parenthesis | plural: parentheses |
| 70. | passerby | plural: passersby |
| 71. | penny | plural: pence or pennies |
| 72. | person | plural: people |
| 73. | phenomenon | plural: phenomena |
| 74. | plateau | plural: plateaus or plateaux |
| 75. | poet laureate | plural: poets laureate |
| 76. | policeman | plural: policemen |
| 77. | radius | plural: radii or radiuses |
| 78. | runner-up | plural: runners-up |
| 79. | salesman | plural: salesmen |
| 80. | saleswoman | plural: saleswomen |
| 81. | sergeant major | plural: sergeants major |
| 82. | sister-in-law | plural: sisters-in-law |
| 83. | stimulus | plural: stimuli |
| 84. | stratum | plural: strata |
| 85. | syllabus | plural: syllabi or syllabuses |
| 86. | synthesis | plural: syntheses |
| 87. | tableau | plural: tableaux or tableaus |
| 88. | terminus | plural: termini or terminuses |
| 89. | testis | plural: testes |
| 90. | thesaurus | plural: thesauri or thesauruses |
| 91. | thesis | plural: theses |
| 92. | tooth | plural: teeth |
| 93. | trauma | plural: traumas or traumata |
| 94. | vertebra | plural: vertebrae |
| 95. | vertex | plural: vertexes or vertices |
| 96. | viscus | plural: viscera |
| 97. | vita | plural: vitae |
| 98. | vortex | plural: vortexes or vortices |
| 99. | woman | plural: women |
| 100. | workman | plural: workmen |