third declension masc/fem nouns

auctoritas, auctoritatis

authority, influence

Caesar, Caesaris

Caesar

caritas, caritatis

charity, love

centurio, centurionis

centurion

civitas, civitatis

state

clamor, clamoris

shout, a shouting

classis, classis

fleet

cohors, cohortis

cohort

consul, consulis

consul

crux, crucis

cross

custos, custodis

guard

dolor, doloris

pain, sorrow

dux, ducis

leader

eques, equitis

horseman

equites, equitum

cavalry

fines, finium

territory

frater, fratris

brother

homo, hominis

man, mankind

imperator, imperatoris

general, commander in chief

labor, laboris

effort, toil

legio, legionis

legion

lex, legis

law

libertas, libertatis

liberty

lux, lucis

light

majores, majorum

ancestors, forefathers

mater, matris

mother

miles, militis

soldier

magnitudo, magnitudinis

size, greatness

mors, mortis

death

mos, moris

custom, habit

munitio, munitionis

fortification

nemo, neminis

no one

nox, noctis

night

obses, obsidis

hostage

oratio, orationis

speech, prayer

ordo, ordinis

rank, formation

pater, patris

father

pax, pacis

peace

pes, pedis

foot

pons, pontis

bridge

princeps, principis

chief, leading man

ratio, rationis

reason, manner, plan, way

regio, regionis

region

rex, regis

king

salus, salutis

safety, welfare, salvation

tempus, temporis

time

timor, timoris

fear

veritas, veritatis

truth

virtus, virtutis

courage, virtue

voluntas, voluntatis

goodwill, will

vox, vocis

voice, cry