Nouns with Irregular Plurals
* Child - Children
* Foot - Feet
* Goose - Geese
* Man - Men
* Mouse - Mice
* Ox - Oxen
* Person - People
* Tooth - Teeth
* Woman - Women
Nouns with Same Singular and Plural Forms
* Deer - Deer
* Fish - Fish (can also be "fishes" when referring to different species)
* Sheep - Sheep
* Series - Series
* Species - Species
Nouns with Irregular Plurals (Foreign Origin)
* Alumnus - Alumni (masculine)
* Alumna - Alumnae (feminine)
* Analysis - Analyses
* Axis - Axes
* Basis - Bases
* Cactus - Cacti
* Crisis - Crises
* Datum - Data
* Formula - Formulae
* Genus - Genera
* Index - Indices
* Matrix - Matrices
* Medium - Media (plural of "medium")
* Memorandum - Memoranda
* Octopus - Octopi or Octopuses
* Phenomenon - Phenomena
* Radius - Radii
* Stimulus - Stimuli
* Syllabus - Syllabi
Tips for Remembering Irregular Plurals
* Practice: The more you use these words, the more likely you are to remember their plural forms.
* Mnemonics: Create memory devices or rhymes to help you remember the irregular forms.
* Dictionary: Consult a dictionary if you are unsure of the plural form of a noun.
Let me know if you'd like to explore other categories of irregular nouns or need further help!