Here’s a list of singular words along with their plural forms:
- Cat – Cats
- Dog – Dogs
- Bird – Birds
- House – Houses
- Car – Cars
- Child – Children
- Man – Men
- Woman – Women
- Mouse – Mice
- Goose – Geese
- Tooth – Teeth
- Foot – Feet
- Person – People
- Fish – Fish (plural and singular are the same for some species)
- Deer – Deer (plural and singular are the same for this animal)
- Cactus – Cacti
- Focus – Foci
- Oasis – Oases
- Crisis – Crises
- Knife – Knives
- Wife – Wives
- Leaf – Leaves
- Hero – Heroes
- Potato – Potatoes
- Tomato – Tomatoes
- Louse – Lice
- Elf – Elves
- Thief – Thieves
- Dwarf – Dwarves
- Calf – Calves
- Half – Halves
- Life – Lives
- Wolf – Wolves
- Shelf – Shelves
- Chief – Chiefs
- Reef – Reefs
- Belief – Beliefs
- Roof – Roofs
- Dwarf – Dwarfs (alternative plural)
- Roof – Rooves (alternative plural)
- Wife – Wifes (rarely used alternative plural)
- Elf – Elfs (rarely used alternative plural)
- Wolf – Wolfs (rarely used alternative plural)
- Leaf – Leafage
- Loaf – Loaves
- Scarf – Scarves
- Sheaf – Sheaves
- Thresh – Thraves
- Fox – Foxes
- Ox – Oxen
- Fish – Fish (plural and singular are the same for some species)
- Sheep – Sheep (same as fish, plural and singular are the same)
- Bison – Bison (same as fish and sheep)
- Aircraft – Aircraft (same as fish, sheep, and bison)
- Series – Series (same as fish, sheep, bison, and aircraft)
- Species – Species (same as fish, sheep, bison, aircraft, and series)
- Amoeba – Amoebae
- Antenna – Antennae
- Appendix – Appendices
- Axis – Axes
- Bacterium – Bacteria
- Basis – Bases
- Criterion – Criteria
- Diagnosis – Diagnoses
- Fungus – Fungi
- Genius – Geniuses
- Hypothesis – Hypotheses
- Index – Indices
- Locus – Loci
- Matrix – Matrices
- Radius – Radii
- Thesis – Theses
- Alumnus – Alumni
- Analysis – Analyses
- Curriculum – Curricula
- Datum – Data
- Medium – Media
- Echo – Echoes
- Mosquito – Mosquitoes
- Volcano – Volcanoes
- Domino – Dominoes
- Radio – Radios
- Video – Videos
- Piano – Pianos
- Solo – Solos
- Zero – Zeroes
- Hippo – Hippos
- Kangaroo – Kangaroos
- Rhino – Rhinos
- Photo – Photos
- Studio – Studios
- Portfolio – Portfolios
- Zoo – Zoos
- Syllabus – Syllabi
- Nucleus – Nuclei
- Seraph – Seraphim
- Avocado – Avocados
- Tornado – Tornadoes
- Buffalo – Buffaloes
- Mango – Mangoes