Regular and Irregular Nouns (Rules, Examples, Lists & Worksheet)

Regular and Irregular Nouns

We can make some nouns plural easily without changing them but in some cases, nouns become irregular when we change them into plural form. Let’s discuss how nouns become plural and how to identify regular and irregular nouns.

We are going to learn today,

Regular Nouns

Definition & Examples

The regular nouns are made plural by addition of -s or -es at the end of noun. These are super easy to make plural and do not involve any complication.

Examples

SingularPlural
BottleBottles
BossBosses
ToyToys
ChairChairs

List of Regular Nouns

SingularPlural
BatBats
BallBalls
BagBags
BoyBoys
BoatBoats
BottleBottles
BraceletBracelets
BrotherBrothers
CarCars
CapCaps
ContinentContinents
DayDays
ChairChairs
DreamDreams
DogDogs
DonkeyDonkeys
GirlGirls
HandHands
HouseHouses
KeyKeys
MotherMothers
OceanOceans
ParkParks
PenPens
PhonePhones
PhotographPhotographs
PianoPianos
RayRays
RiverRivers
SisterSisters
StateStates
TableTables
TreeTrees
ThoughtThoughts
ToyToys
TownTowns
VideoVideos
WebsiteWebsites

Irregular Nouns

Definition & Examples

In some cases, we cannot make nouns plural by addition or -s or -es — rather spellings become different when making them plural. These are called irregular nouns.

Examples are

SingularPlural
GooseGeese
ManMen
CalfCalves
MouseMice

List of Irregular Nouns

SingularPlural
AddendumAddenda
AlgaAlgae
AlumnaAlumnae
AlumnusAlumni
AnalysisAnalyses
ApexApices
AppendixAppendices
AxisAxes
BacteriumBacteria
BasisBases
ButterflyButterflies
CactusCacti
CavemanCavemen
CherryCherries
ChildChildren
CodexCodices
CrisisCrises
CriterionCriteria
CurriculumCurricula
DatumData
DeerDeer
DwarfDwarves
ElfElves
EllipsisEllipses
FishFish  
FlyFlies
FootFeet  
FormulaFormulae  
FungusFungi  
GooseGeese
HalfHalves
HoofHooves  
HypothesisHypotheses
IndexIndices or indexes
LeafLeaves
LoafLoaves
LocusLoci
LouseLice
ManMen
MatrixMatrices  
MediumMedia  
memorandumMemoranda  
MooseMoose
MouseMice
NappyNappies
NucleusNuclei  
OasisOases
OxOxen
ParenthesisParentheses
PennyPennies
PersonPeople
PhenomenonPhenomena  
PolicemanPolicemen
PoppyPoppies
QuizQuizzes
QuizQuizzes
RadiusRadii
ScarfScarves
ScissorsScissors
SelfSelves
SeriesSeries
SheepSheep
ShelfShelves
ShrimpShrimp
SkySkies
SpeciesSpecies
SwineSwine
SyllabusSyllabi  
synopsisSynopses
TheoryTheories
ThesisTheses
ThiefThieves
ThisThese
ToothTeeth
TryTries
WharfWharves  
WhizWhizzes
WifeWives
WolfWolves
WomanWomen

Rules to Make Plural Nouns

Rule-1: If the noun ends in “-f” or “-fe”, we remove “-f” or “-fe” and add “-ves” to make them plural.

For examples,

  • Loaf —> Loaves
  • Leaf —> Leaves
  • Hoof —> Hooves
  • Life —> Lives
  • Wife —> Wives

However, there are some exceptions like chief —> chiefs.

Rule-2: If the noun ends in “-um” or “-on”, we remove “-um” or “-on” and add “-a” at the end.

Examples

  • Addendum —> Addenda
  • Curriculum —> Curricula
  • Medium —> Media
  • Bacterium —> Bacteria
  • Phenomenon —> Phenomena

Rule-3: If the noun ends in “-us”, we remove “-us” and adds “-i” to make it plural.

Examples

  • Alumnus —> Alumni
  • Cactus —> Cacti
  • Fungus —> Fungi
  • Syllabus —> Syllabi

Rule-4: If the noun ends in “-ix”, the ending is replaced with “-ices” or “ixes” to make it plural.

Examples

  • Appendix —> Appendices or Appendixes
  • Matrix —> Matrices or Matrixes

Rule-5: In some cases, the singular and plural of irregular nouns are same.

Examples

  • Fish —> Fish
  • Bison —> Bison
  • Aircraft —> Aircraft
  • Sheep —> Sheep
  • Deer —> Deer
  • Tuna —> Tuna
  • Trout —> Trout

Rule-6: If the noun ends in “-is”, the end is changed into “-es” to make it plural.

Examples

  • Axis —> Axes
  • Oasis —> Oases
  • Thesis —> Theses
  • Crisis —> Crises

Rule-7: In case the noun ends in “-o”, we add “-s” or “-es” to make it plural.

Examples

  • Taco —>Tacos
  • Avocado —> Avocados
  • Memo —> Memos
  • Tomato —> Tomatoes
  • Potato —> Potatoes

Worksheet / Quiz

Point out the regular and irregular nouns in the given sentences.

  1. There are two tables in my room. (regular / irregular)
  2. Bob’s teeth are white and shiny. (regular / irregular)
  3. The farmer was plowing the field with the help of oxen. (regular / irregular)
  4. Cacti are the plants that belong to the plant family Cactaceae. (regular / irregular)
  5. The factory is in technical and financial crises. (regular / irregular)
  6. Tom has a collection of different types of knives. (regular / irregular)
  7. The children are watching cartoons. (regular / irregular)
  8. He cut the cake into two halves. (regular / irregular)
  9. A pack of wolves was chasing the rabbit. (regular / irregular)
  10. I bought him a bouquet of flowers. (regular / irregular)
  11. She bought colorful balloons to decorate her room. (regular / irregular)
  12. Jacob soaked his feet for 15 minutes. (regular / irregular)
  13. The thieves broke into the house. (regular / irregular)
  14. Prawn and shrimp are types of seafood. (regular / irregular)
  15. There are more than a hundred houses in this colony. (regular / irregular)
Regular and Irregular Nouns Worksheet
Regular and Irregular Nouns Worksheet

Answers

  1. regular noun
  2. irregular noun
  3. irregular noun
  4. irregular noun
  5. irregular noun
  6. irregular noun
  7. irregular noun
  8. irregular noun
  9. irregular noun
  10. regular noun
  11. regular noun
  12. irregular noun
  13. irregular noun
  14. irregular noun
  15. regular noun

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