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