| Singular | Plural | Singular Possessive |
Plural Possessive |
| [NOUN] | [NOUN] +s | [NOUN] +'s | [NOUN] +s' |
| [NOUN] {} {s ss sh ch x o} |
[NOUN] {} +es {s ss sh ch x o} |
[NOUN] {} +'s {s ss sh ch x o} |
[NOUN] {} +es' {s ss sh ch x o} |
| [NOUN] y | [NOUN] y→i +es | [NOUN] y +'s | [NOUN] y→i +es' |
| [NOUN] {} {ay ey oy uy} |
[NOUN] {} +s {ay ey oy uy} |
[NOUN] {} +'s {ay ey oy uy} |
[NOUN] {} +s' {ay ey oy uy} |
| [NOUN] (irregular) |
[NOUN] (irregular) |
[NOUN]+'s (irregular) |
[NOUN]+'s (irregular) |
| aircraft | aircraft | aircraft's | aircraft's | alumnus alumna |
alumni alumnae |
alumnus' alumna's |
alumni's alumnae's |
| analysis | analyses | analysis's | analyses' |
| antenna | antennae antennas |
antenna's | antennae's antennas' |
| apex | apices apexes |
apex's | apices' apexes' |
| appendix | appendices appendixes |
appendix's | appendices' appendixes' |
| asteroid | asteroids | asteroid's | asteroids' |
| axis | axes | axis's | axes' |
| bacterium | bacteria | bacterium's | bacteria's |
| basis | bases | basis's | bases' |
| bison | bison | bison's | bison's |
| bureau | bureaux bureaus |
bureau's | bureaux's bureaus' |
| cactus | cacti cactus cactuses |
cactus's | cacti's cactus's cactuses' |
| carriage | carriages | carriage's | carriages' |
| château | châteaux châteaus |
château's | châteaux's châteaus' |
| child | children | child's | children's |
| codex | codices | codex's | codices' |
| comma | commas | comma's | commas' |
| comet | comets | comet's | comets' |
| concerto | concerti concertos |
concerto's | concerti's concertos' |
| crisis | crises | crisis's | crises' |
| criterion | criteria criterions |
criterion's | criteria's criterions' |
| curriculum | curricula curriculums |
curriculum's | curricula's curriculums' |
| datum | data | datum's | data's |
| deer | deer deers |
deer's | deer's deers' |
| diagnosis | diagnoses | diagnosis's | diagnoses' |
| die | dice dies |
die's | dice's dies' |
| dwarf | dwarves dwarfs |
dwarf's | dwarves' dwarfs' |
| ellipsis | ellipses | ellipsis's | ellipses' |
| elk | elks | elk's | elks' |
| fish | fish fishes |
fish's | fish's fishes' |
| focus | foci focuses |
focus's | foci's focuses' |
| foot | feet foot |
foot's | feet's foot's |
| formula | formulae formulas |
formula's | formulae's formulas' |
| fungus | fungi funguses |
fungus's | fungi's funguses' |
| genus | genera genuses |
genus's | genera's genuses' |
| giraffe | giraffes | giraffe's | giraffes' |
| goose | geese | goose's | geese's |
| graffito | graffiti | graffito's | graffiti's |
| grouse | grouse grouses |
grouse's | grouse's grouses' |
| half | halves | half's | halves' |
| hippopotamus | hippopotami hippopotamuses |
hippopotamus's | hippopotami's hippopotamuses' |
| hoof | hooves hoofs |
hoof's | hooves' hoofs' |
| hypothesis | hypotheses | hypothesis's | hypotheses' |
| index | indices indexes |
index's | indices' indexes' |
| Indian | Indians | Indian's | Indians' |
| larva | larvae larvas |
larva's | larvae's larvas' |
| loaf | loaves | loaf's | loaves' |
| locus | loci | locus's | loci's |
| louse | lice | louse's | lice's |
| man | men | man's | men's |
| matrix | matrices matrixes |
matrix's | matrices' matrixes' |
| a medium | media mediums |
a medium's | media's mediums' |
| media | media | media's | media's |
| memorandum | memoranda memorandums |
memorandum's | memoranda's memorandums' |
| minutia | minutiae | minutia's | minutiae's |
| moose | moose | moose's | moose's |
| mouse | mice | mouse's | mice's |
| nebula | nebulae nebulas |
nebula's | nebulae's nebulas' |
| nucleus | nuclei nucleuses |
nucleus's | nuclei's nucleuses' |
| oasis | oases | oasis's | oases' |
| octapus | octopi octapuses |
octapus's | octopi's octapuses' |
| offspring | offspring offsprings |
offspring's | offspring's offsprings |
| opus | opera opuses |
opus's | opera's opuses' |
| orange | oranges | orange's | oranges' |
| ovum | ova | ovum's | ova's |
| ox | oxen ox |
ox's | oxen's ox's |
| parenthesis | parentheses | parenthesis's | parentheses' |
| phenomenon | phenomena phenomenons |
phenomenon's | phenomena's phenomenons' |
| phylum | phyla | phylum's | phyla's |
| prognosis | prognoses | prognosis's | prognoses' |
| quail | quail quails |
quail's | quail's quails' |
| quiz | quizzes | quiz's | quizzes' |
| radius | radii radiuses |
radius's | radii's radiuses' |
| referendum | referenda referendums |
referendum's | referenda's referendums' |
| rhinoceros | rhinoceri rhinoceros rhinoceroses |
rhinoceros's | rhinoceri's rhinoceros's rhinoceroses' |
| salmon | salmon salmons |
salmon's | salmon's salmons' |
| scarf | scarves scarfs |
scarf's | scarves' scarfs' |
| self | selves | self's | selves' |
| series | series | series's | series' |
| sheep | sheep | sheep's | sheep's |
| shrimp | shrimp shrimps |
shrimp's | shrimp's shrimps' |
| species | species | species's | species |
| stimulus | stimuli | stimulus's | stimuli's |
| tooth | teeth | tooth's | teeth's |
| swine | swine | swine's | swine's |
| syllabus | syllabi syllabuses |
syllabus's | syllabi's syllabuses' |
| symposium | symposia symposiums |
symposium's | symposia's symposiums' |
| synopsis | synopses | synopsis's | synopses' |
| thesis | theses | thesis's | theses' |
| thief | thieves | thief's | thieves' |
| tooth | teeth | tooth's | teeth's |
| trout | trout trouts |
trout's | trout's trouts' |
| tuna | tuna tunas |
tuna's | tuna's tunas' |
| vertebra | vertebrae vertebras |
vertebra's | vertebrae's vertebras |
| vertex | vertices vertexes |
vertex's | vertices' vertexes' |
| vortex | vortices vortexes |
vortex's | vortices' vortexes' |
| wharf | wharves wharf's |
wharf's | wharves' wharfs' |
| wife | wives | wife's | wives' |
| wolf | wolves | wolf's | wolves' |
| woman | women | woman's | women's |