As I mentioned in the previous post, I had to come up with a list of irregular plurals in English. This is what I have so far. I'm posting it here because 1) I think they're very pretty words, and 2) if you see any that I'm missing, please post.
calves - calf
elves - elf
halves - half
hooves - hoof
knives - knife
leaves - leaf
lives - life
loaves - loaf
scarves - scarf
selves - self
sheaves - sheaf
shelves - shelf
staves - staff
thieves - thief
wives - wife
wolves - wolf
feet - foot
geese - goose
lice - louse
dice - die
men - man
mice - mouse
teeth - tooth
women - woman
people - person
brethren - brother
children - child
oxen - ox
algae - alga
alumnae - alumna
amoebae - amoeba
antennae - antenna
coronae - corona
faunae - fauna
florae - flora
formulae - formula
larvae - larva
nebulae - nebula
novae - nova
placentae - placenta
pupae - pupa
retinae - retina
supernovae - supernova
vertebrae - vertebra
alumnus - alumni
bacillus - bacilli
cacti - cactus
foci - focus
fungi - fungus
hippopotami - hippopotamus
magi - magus
nuclei - nucleus
octopi - octopus
radii - radius
stimuli - stimulus
syllabi - syllabus
termini - terminus
thesauri - thesaurus
addenda - addendum
bacteria - bacterium
curricula - curriculum
data - datum
errata - erratum
genera - genus
media - medium
memoranda - memorandum
millenia - millenium
ova - ovum
strata - stratum
symposia - symposium
stadia - stadium
apices - apex
appendices - appendix
cervices - cervix
indices - index
matrices - matrix
vortices - vortex
analyses - analysis
axes - axis
bases - basis
crises - crisis
diagnoses - diagnosis
ellipses - ellipsis
emphases - emphasis
hypotheses - hypothesis
metamorphoses - metamorphosis
neuroses - neurosis
oases - oasis
paralyses - paralysis
parentheses - parenthesis
synopses - synopsis
syntheses - synthesis
theses - thesis
criteria - criterion
phenomena - phenomenon
automata - automaton
schemata - schema
stigmata - stigma
cherubim - cherub
seraphim - seraph
beaux - beau
tableaux - tableau
calves - calf
elves - elf
halves - half
hooves - hoof
knives - knife
leaves - leaf
lives - life
loaves - loaf
scarves - scarf
selves - self
sheaves - sheaf
shelves - shelf
staves - staff
thieves - thief
wives - wife
wolves - wolf
feet - foot
geese - goose
lice - louse
dice - die
men - man
mice - mouse
teeth - tooth
women - woman
people - person
brethren - brother
children - child
oxen - ox
algae - alga
alumnae - alumna
amoebae - amoeba
antennae - antenna
coronae - corona
faunae - fauna
florae - flora
formulae - formula
larvae - larva
nebulae - nebula
novae - nova
placentae - placenta
pupae - pupa
retinae - retina
supernovae - supernova
vertebrae - vertebra
alumnus - alumni
bacillus - bacilli
cacti - cactus
foci - focus
fungi - fungus
hippopotami - hippopotamus
magi - magus
nuclei - nucleus
octopi - octopus
radii - radius
stimuli - stimulus
syllabi - syllabus
termini - terminus
thesauri - thesaurus
addenda - addendum
bacteria - bacterium
curricula - curriculum
data - datum
errata - erratum
genera - genus
media - medium
memoranda - memorandum
millenia - millenium
ova - ovum
strata - stratum
symposia - symposium
stadia - stadium
apices - apex
appendices - appendix
cervices - cervix
indices - index
matrices - matrix
vortices - vortex
analyses - analysis
axes - axis
bases - basis
crises - crisis
diagnoses - diagnosis
ellipses - ellipsis
emphases - emphasis
hypotheses - hypothesis
metamorphoses - metamorphosis
neuroses - neurosis
oases - oasis
paralyses - paralysis
parentheses - parenthesis
synopses - synopsis
syntheses - synthesis
theses - thesis
criteria - criterion
phenomena - phenomenon
automata - automaton
schemata - schema
stigmata - stigma
cherubim - cherub
seraphim - seraph
beaux - beau
tableaux - tableau
no subject
One of my favorites is gris-gris and gris-gris - identical spelling, different inflection. Gotta love those wacky French.