A plural noun is a noun that refers to more than one person, place, thing, or idea. Most singular nouns are made plural by adding a suffix, usually –s or –es. For example, the singular noun dog takes the plural form dogs, as in three dogs. This list is not of course extensive.
| 1 | addendum | addenda | |
| 2 | aircraft | aircraft | |
| 3 | alumna | alumnae | |
| 4 | alumnus | alumni | |
| 5 | Amino | Aminos | |
| 6 | analysis | analyses | |
| 7 | antenna | antennae | |
| 8 | antithesis | antitheses | |
| 9 | apex | apices | |
| 10 | appendix | appendices (or appendixes in a medical context) | |
| 11 | Audio | Audios | |
| 12 | axis | axes | |
| 13 | Baby | Babies | |
| 14 | bacillus | bacilli | |
| 15 | bacterium | bacteria | |
| 16 | basis | bases | |
| 17 | beau | beaux | |
| 18 | Beef | Beefs | |
| 19 | Belief | Beliefs | |
| 20 | biceps | bicepses | |
| 21 | bison | bison | |
| 22 | Bonus | Bonuses | |
| 23 | bureau | bureaux | |
| 24 | cactus | cacti | |
| 25 | Calf | Calves | |
| 26 | château | châteaux | |
| 27 | child | children | |
| 28 | Chorus | Choruses | |
| 29 | Circus | Circuses | |
| 30 | City | Cities | |
| 31 | Cliff | Cliffs | |
| 32 | Cod | Cod | |
| 33 | codex | codices | |
| 34 | concerto | concerti or concertos | |
| 35 | confetto | confetti | |
| 36 | corpus | corpora | |
| 37 | crisis | crises | |
| 38 | criterion | criteria | |
| 39 | cul-de-sac | cul-de-sac | translates to “bottom of a sack.” |
| 40 | curriculum | curricula or curriculums | |
| 41 | datum | data (nowadays, data is often used as a singular and plural noun) | |
| 42 | deer | deer | |
| 43 | diagnosis | diagnoses | |
| 44 | die | dice or dies | |
| 45 | dwarf | dwarves or dwarfs | |
| 46 | Echo | Echoes | |
| 47 | Elf | Elves | |
| 48 | ellipsis | ellipses | |
| 49 | erratum | errata | |
| 50 | Family | Families | |
| 51 | faux pas | faux pas | |
| 52 | fez | fezzes or fezes | |
| 53 | Fish | Fish | |
| 54 | focus | foci | |
| 55 | foot | feet | |
| 56 | formula | formulae | |
| 57 | Fry | Fries | |
| 58 | fungus | fungi | |
| 59 | genus | genera or genuses | |
| 60 | goose | geese | |
| 61 | graffito | graffiti | |
| 62 | grouse | grouse | |
| 63 | Gulf | Gulfs | |
| 64 | half | halves | |
| 65 | Hero | Heroes | |
| 66 | hoof | hooves | |
| 67 | hypothesis | hypotheses | |
| 68 | index | indices | |
| 69 | Knife | Knives | |
| 70 | larva | larvae | |
| 71 | lasagna | lasagne | |
| 72 | Leaf | Leaves | |
| 73 | libretto | libretti | |
| 74 | loaf | loaves | |
| 75 | locus | loci | |
| 76 | louse | lice | |
| 77 | man | men | |
| 78 | matrix | matrices | |
| 79 | medium | media | |
| 80 | memorandum | memoranda | |
| 81 | minutia | minutiae | |
| 82 | moose | moose | |
| 83 | mouse | mice | |
| 84 | nebula | nebulae | |
| 85 | nucleus | nuclei | |
| 86 | oasis | oases | |
| 87 | octopus | Octopodes | NOT octopi |
| 88 | offspring | offspring | |
| 89 | opus | opera | |
| 90 | ovum | ova | |
| 91 | ox | oxen | |
| 92 | parenthesis | parentheses | |
| 93 | Person | people | |
| 94 | phenomenon | phenomena | |
| 95 | Photo | Photos | |
| 96 | phylum | phyla | |
| 97 | Potato | Potatoes | |
| 98 | Pyjamas | Pyjamas | |
| 99 | quiz | quizzes | |
| 100 | Radio | Radios | |
| 101 | Radius | Radii | |
| 102 | Reef | Reefs | |
| 103 | referendum | referenda | |
| 104 | Relief | Reliefs | |
| 105 | Rice | Rice | |
| 106 | salmon | salmon | |
| 107 | scarf | scarves | |
| 108 | Scenario | Scenarios | |
| 109 | self | selves | |
| 110 | series | series | |
| 111 | sheep | sheep | |
| 112 | shrimp | shrimp | |
| 113 | spaghetto | spaghetti | |
| 114 | species | species | |
| 115 | sphinx | sphinges | |
| 116 | Status | Statuses | |
| 117 | stimulus | stimuli | |
| 118 | stratum | strata | |
| 119 | swine | swine | |
| 120 | syllabus | syllabi or syllabuses | |
| 121 | symposium | symposia | |
| 122 | synopsis | synopses | |
| 123 | Synthesis | Syntheses | |
| 124 | tableau | tableaux | |
| 125 | Terminus | Termini | |
| 126 | Thesaurus | Thesauri or Thesauruses | |
| 127 | thesis | theses | |
| 128 | thief | thieves | |
| 129 | Tomato | Tomatoes | |
| 130 | tooth | teeth | |
| 131 | trout | trout | |
| 132 | Tuna | Tuna | |
| 133 | vertebra | vertebrae | |
| 134 | vertex | vertices | |
| 135 | Veto | Vetoes | |
| 136 | Virus | Viruses | |
| 137 | vita | vitae | |
| 138 | Volcano | Volcanoes | |
| 139 | vortex | vortices | |
| 140 | wharf | wharves | |
| 141 | wife | wives | |
| 142 | wolf | wolves | |
| 143 | woman | women | |