A list of some common irregular plural nouns in English:

  1. Child – Children
  2. Foot – Feet
  3. Tooth – Teeth
  4. Man – Men
  5. Woman – Women
  6. Mouse – Mice
  7. Ox – Oxen
  8. Person – People
  9. Goose – Geese
  10. Knife – Knives
  11. Half – Halves
  12. Loaf – Loaves
  13. Die – Dice
  14. Index – Indices (or indexes)
  15. Cactus – Cacti (or cactuses)
  16. Thesis – Theses
  17. Phenomenon – Phenomena
  18. Criterion – Criteria
  19. Alumnus – Alumni
  20. Syllabus – Syllabi (or syllabuses)
  21. Elf – Elves
  22. Moose – Moose
  23. Fish – Fish
  24. Sheep – Sheep
  25. Deer – Deer
  26. Wolf – Wolves
  27. Quail – Quail
  28. Octopus – Octopuses (or octopodes)
  29. Plural – Plurals
  30. Virus – Viruses
  31. Passerby – Passersby
  32. Brother – Brothers
  33. Sister – Sisters
  34. Corpus – Corpses (or corpora)
  35. Analysis – Analyses
  36. Crisis – Crises
  37. Basis – Bases
  38. Diagnosis – Diagnoses (or diagnostics)
  39. Parenthesis – Parentheses
  40. Index – Indices (or indexes)
  41. Calf – Calves
  42. Knife – Knives
  43. Leaf – Leaves
  44. Life – Lives
  45. Half – Halves
  46. Scarf – Scarves
  47. Self – Selves
  48. Sheaf – Sheaves
  49. Thief – Thieves
  50. Wharf – Wharves