- Irregular plural nouns are nouns that do not follow the typical rules for forming plurals in English. Unlike regular plural nouns, which usually add “s” or “es” to the end of the singular form, irregular plurals undergo more significant changes. These changes can include alterations in the word’s spelling, pronunciation, or even its structure.
1. Man – Men
2. Woman – Women
3. Child Children
4. Tooth- Teeth
5. Foot – Feet
6. Mouse – Mice
7. Goose – Geese
8. Person – People
9. Ox – Oxen
10. Fish – Fish (or Fishes)
11. Sheep – Sheep
12. Deer – Deer
13. Moose – Moose
14. Series – Series
15. Species – Species
16. Aircraft – Aircraft
17. Alumnus – Alumni
18. Datum – Data
19. Bacterium Bacteria
20. Cactus – Cacti
21. Criterion – Criteria
22. Phenomenon – Phenomena
23. Medium – Media
24. Analysis – Analyses
25. Axis -Axes.
26. Crisis – Crises
27. Diagnosis – Diagnoses
28. Hypothesis – Hypotheses
29. Oasis- Oases
30. Thesis – Theses
31. Syllabus – Syllabi
32. Focus – Foci
33. Fungus – Fungi
34. Nucleus – Nuclei
35. Radius- Radii
36. Stimulus – Stimuli
37. Genus – Genera
38. Louse- Lice
39. Goose – Geese
40. Manservant – Menservants
41. Womanservant – Womenservants
43. Curriculum – Curricula
42. Penny – Pence
44. Memorandum -Memoranda
45. Formula – Formulae
46. Vertebra – Vertebrae
47. Appendix – Appendices
48. Index- Indices
49. Matrix – Matrices
50. Vertex – Vertices
51. Vortex – Vortices
52. Appendix – Appendices
53. Octopus – Octopuses/Octopi
54. Hippopotamus Hippopotamuses/Hippopotami
55. Syllabus – Syllabi/Syllabuses
56. Corpus – Corpora
57. Genus – Genera
58. Erratum – Errata
59. Millennium – Millennia
60. Memorandum Memoranda
61. Bureau – Bureaux/Bureaus
62. Plateau – Plateaux/Plateaus
63. Tableau – Tableaux/Tableaus
64. Cherub – Cherubim
65. Seraph – Seraphim
66. Offspring – Offspring
67. Deer – Deer
68. Fish -Fish
69. Swine- Swine
70. Trout- Trout
71. Salmon – Salmon
72. Bison- Bison
73. Moose – Moose
74. Antelope – Antelope
75. Cod – Cod
76. Pike Pike
77. Reindeer – Reindeer
78. Grouse – Grouse
79. Series – Series
80. Species — Species
81. Works – Works
82. Headquarters Headquarters
83. Means – Means
85. Tuna Tuna/Tunas
84. Shrimp — Shrimp/Shrimps
86. Barracks – Barracks
87. Crossroads – Crossroads
88. Dice – Dice
89. Elk — Elk
90. Hovercraft– Hovercraft
91. Mongoose – Mongooses
92. Watercraft – Watercraft
93. Woodlouse – Woodlice
94. Cloakroom – Cloakrooms
95. Knack- Knacks
96. Cul-de-sac — Cul-de-sacs
97. Passerby – Passersby
98. Standby- Standbys
99. Attorney General — Attorneys General
100. Notary Public — Notaries Public
Irregular plurals add richness and complexity to the English language. While they can be challenging to learn, understanding their forms and usage is essential for effective communication. By studying these unique plural forms, you enhance your grammatical skills and deepen your appreciation for the intricacies of English.
