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