Irregular Noun Examples
An irregular noun is a noun that does not follow the typical rules for forming plurals. Instead of adding "s" or "es" to create the plural form, these nouns change in unique ways.
Here's a list of common irregular noun examples:
Irregular Nouns for Animals
Child → Children
Deer → Deer
Fish → Fish
Foot → Feet
Goose → Geese
Louse → Lice
Man → Men
Mouse → Mice
Ox → Oxen
Person → People
Tooth → Teeth
Woman → Women
Irregular Nouns for Objects
Aircraft → Aircraft
Appendix → Appendices
Axis → Axes
Cactus → Cacti
Crisis → Crises
Datum → Data
Die → Dice
Fungi → Fungus
Index → Indices
Knife → Knives
Leaf → Leaves
Life → Lives
Loaf → Loaves
Matrix → Matrices
Medium → Media
Mouse → Mice
Oasis → Oases
Parenthesis → Parentheses
Phenomenon → Phenomena
Radius → Radii
Stimulus → Stimuli
Thesis → Theses
Tooth → Teeth
Vertebra → Vertebrae
Wolf → Wolves
Irregular Nouns for People
Brother → Brethren
Child → Children
Foot → Feet
Gentleman → Gentlemen
Man → Men
Mouse → Mice
Ox → Oxen
Person → People
Police → Police
Tooth → Teeth
Woman → Women
Irregular Nouns for Miscellaneous Items
Analysis → Analyses
Antenna → Antennae
Bacterium → Bacteria
Crisis → Crises
Curriculum → Curricula
Datum → Data
Diagnosis → Diagnoses
Formula → Formulae
Hypothesis → Hypotheses
Oasis → Oases
Phenomenon → Phenomena
Radius → Radii
Series → Series
Species → Species
Thesis → Theses
Time → Times
Tooth → Teeth