mouse
mice
tooth
teeth
formula
formulae
species
species
bacterium
bacteria
phenomenon
phenomena
tooth
teeth
life
lives
vertebra
vertebrae
foot
feet
offspring
offspring
fish
fish
ox
oxen
deer
deer
moose
moose
series
series
half
halves
self
selves
wolf
wolves
loaf
loaves
leaf
leaves
elf
elves
die/dice
dice
index
indeces
oasis
oases
child
children
salmon
salmon
man
men
person
people
Wife
Wives
hypothesis
hypotheses
nucleus
nuclei
medium
media
scarf
scarves
knife
knives
sheep
sheep
goose
geese
cactus
cacti
matrix
matrices
analysis
analyses
alumnus
alumni
woman
women
louse
lice
thesis
theses
fungus
fungi
appendix
appendices
axis
axes