| Singular | Plural |
|---|---|
| aardwolf /ˈɑːdwʊlf/ | aardwolves /ˈɑːdwʊlvz/ |
| alms /ɑːmz/ | alms |
| brother /ˈbɹɐðə*/ | brethren /ˈbɹɛðɹən/ 1 |
| calf /kɑːf/ | calves /kɑːvz/ |
| child /tʃaɪld/ | children /ˈtʃɪldɹən/ |
| cod /kɒd/ | cod |
| cow /kaʊ/ | kine /kaɪn/ 1 |
| craft /kɹɑːft/ | craft 2 |
| deer /dɪə*/ | deer |
| elf /ɛlf/ | elves /ɛlvz/ |
| fish /fɪʃ/ | fish |
| gallows /ˈgæləʊz/ | gallows |
| goose /guːs/ | geese /giːs/ |
| grouse /gɹaʊs/ | grouse |
| house /haʊs/ | houses /ˈhaʊzɪz/ 3 |
| hoof /huːf/ | hooves /huːvz/ |
| knife /naɪf/ | knives /naɪvz/ |
| leaf /liːf/ | leaves /liːvz/ |
| life /laɪf/ | lives /laɪvs/ |
| loaf /ləʊf/ | loaves /ləʊvz/ |
| louse /laʊs/ | lice /laɪs/ |
| man /mæn/ | men /mɛn/ |
| means /miːnz/ | means |
| moose /muːs/ | moose |
| mouse /maʊs/ | mice /maɪs/ |
| ox /ɒks/ | oxen /ˈɒksn/ |
| pike /paɪk/ | pike |
| salmon /ˈsæmən/ | salmon |
| scarf /skɑːf/ | scarves /skɑːvz/ 1 |
| sheaf /ʃiːf/ | sheaves /ʃiːvz/ |
| sheep /ʃiːp/ | sheep |
| shelf /ʃɛlf/ | shelves /ʃɛlvz/ |
| swine /swaɪn/ | swine |
| Swiss /swɪs/ | Swiss |
| thief /θiːf/ | thieves /θiːvz/ |
| tooth /tuːθ/ | teeth /tiːθ/ |
| trout /tɹaʊt/ | trout |
| wharf /ʍɔːf/ | wharves /ʍɔːvz/ 1 |
| wolf /wʊlf/ | wolves /wʊlvz/ |
| woman /ˈwʊmən/ | women /ˈwɪmɪn/ |
| Singular | Plural |
|---|---|
| addendum /əˈdɛndəm/ | addenda /əˈdɛndə/ |
| alga /ˈælgə/ | algae /ˈælgi/ |
| alumna /əˈlɐmnə/ | alumnae /əˈlɐmni/ |
| alumnus /əˈlɐmnəs/ | alumni /əˈlɐmaɪ/ |
| automaton /ɔˈtɒmət(ə)n/ | automata /ɔˈtɒmətə/ |
| axis /ˈæksɪs/ | axes /ˈæksiːz/ |
| basis /ˈbeɪsɪs/ | bases /ˈbeɪsiːz/ |
| cactus /ˈkæktəs/ | cacti /ˈkæktaɪ/ 1 |
| cherub /ˈtʃɛɹəb/ | cherubim /ˈtʃɛɹəbɪm/ 1 |
| concerto /ˈkɒnˈtʃɛətəʊ/ | concerti /ˈkɒnˈtʃɛətɪ/ 1 |
| corpus /ˈkɔːpəs/ | corpora /kɔːpəɹə/ |
| crisis /ˈkɹaɪsɪs/ | crises /ˈkɹaɪsiːz/ |
| criterion /kɹaɪˈtɪəɹɪən/ | criteria /kɹaɪˈtɪəɹɪə/ |
| datum /ˈdeɪtəm/ | data /ˈdeɪtə/ |
| formula /ˈfɔːmjʊlə/ | formulae /ˈfɔːmjʊlaɪ/ 1 |
| forum /ˈfɔːɹəm/ | fora /ˈfɔːɹə/ 1 |
| fungus /ˈfɐŋgəs/ | fungi /ˈfɐndʒaɪ/ |
| hippopotamus /ˈhɪpəˈpɒtəməs/ | hippopotami /hɪpəˈpɒtəmaɪ/ 1 |
| index /ˈɪndɛks/ | indices /ˈɪndɪsiːz/ 1 |
| matrix /ˈmeɪtɹɪks/ | matrices /ˈmeɪtɹɪsiːz/ 1 |
| memorandum /mɛməˈɹændəm/ | memoranda 1 /mɛməˈɹændə/ |
| millenium /mɪˈlɛnɪəm/ | millennia /mɪˈlɛnɪə/ |
| narcissus /nɑːˈsɪsəs/ | narcissi 1 /nɑːˈsɪsaɪ/ |
| oasis /əʊˈeɪsɪs/ | oases /əʊˈeɪsiz/ |
| paparazzo /pɑːpəˈɹɑːtsəʊ/ | paparazzi /pɑːpəˈɹɑːtsɪ/ |
| phenomenon /fəˈnɒmɪnən/ | phenomena /fəˈnɒmɪnə/ |
| radius /ˈɹeɪdɪəs/ | radii /ˈɹeɪdɪaɪ/ |
| samurai /ˈsæmʊɹaɪ/ | samurai |
| series /ˈsɪəriːz/ | series |
| species /ˈspiːʃiːz/ | species |
| stigma /ˈstɪɡmə/ | stigmata 1 /stɪɡˈmɑːtə/ |
| tsunami /(t)sʊˈnɑmɪ/ | tsunami 1 |
| vertex /ˈvɜtɛks/ | vertices 1 /ˈvɜtɪsiːz/ |
| vortex /ˈvɔtɛks/ | vortices 1 /ˈvɔtɪsiːz/ |