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