Third Declension Nouns (like rex, opus, hostis and mare)

clamor, clamoris, m

shout

consul, consulis, m

consul

custos, custodis, m

guard

frater, fratris, m

brother

Iuppiter, Iovis, m

Jupiter

iuvenis, iuvenis, m

young man

legio, legionis, f

legion

mater, matris, f

mother

mercator, mercatoris, m

merchant

miles, militis, m

soldier

pater, patris, m

father

rex, regis, m

king

soror, sororis, f

sister

uxor, uxoris, f

wife

carmen, carminis, n

song

corpus, corporis, n

body

flumen, fluminis, n

river

opus, operis, n

work, task

civis, -is, m

citizen

hostis, -is, m

enemy

mons, -ntis, m

mountain

navis, -is, f

ship

nox, noctis, f

night

urbs, urbis, f

city

mare, -ris, n

sea