calf calves, becerros

elf elves, duendes

half halves, mitades

knife knives, cuchillos

leaf leaves, hojas

life lives, vidas

loaf loaves, hogaza

self selves, seres

sheaf sheaves, haces

shelf shelves, estantes

thief thieves, ladrones

wife wives, esposas

wolf wolves, lobos

dwarf dwarfs/dwarves, enanos

hoof hoofs/hooves, pezuñas

scarfs scarfs/scarves, bufandas

turf turfs/turves, céspedes

brother brethren, hermanos (monjes)

child children, niños

ox oxen, bueyes

man men, hombres

woman women, mujeres

alga algae, algas

axis axes, ejes

bacillus bacilli, bacilos

pelvis pelves, pelvis

oasis oases, oasis

larva larvae, larvas

dormouse dormice, lirones

goose geese, gansos

mouse mice, ratones

foot feet, pies

louse lice, piojos

tooth teeth, dientes