(i.) TOR (-SOR), M.
-TRIX, F.
Agent or doer of an action
ac-tor = doer,formed fromag = do.
auc-tor = makeraug = increase.
vic-tor = conquerorvic = conquer.
petī-tor = candidatepet = seek.
ton-sor = barbertem = cut.

(ii.) Abstract Nouns and Names of Actions.

-OR, -SUS (= -TUS), M.

-ĒS, -IA (-IES), -TIA (-TIES), -IŌ, -TIŌ,
-TĀS, -TŪS, -TŪDŌ, -DŌ, -GŌ, -NIA,
F.

-US, -IUM, -ITIUM, -NIUM, -LIUM, -CINIUM, N.

tĭm-or= fearformed fromtĭm-ere = to fear.
sen-sus= feelingsent-ire = to feel.
sēd-ēs= seatsĕd-ēre = to sit.
audāc-ia= boldnessaudax = bold.
segnĭt-ies= lazinesssegnis = lazy.
tristĭ-tia= sadnesstristis = sad.
lĕg-io= a collecting
a legion
lĕg-ere = to collect.
sălūtā-tio= a greetingsalutare = to greet.
bŏnĭ-tas= goodnessbonus = good.
sĕnec-tūs= agesenex = old.
magni-tudo= greatnessmagnus = great.
cupī-dō= desirecupere = to desire.
vertī-go= a turning
giddiness
vertere = to turn.
pĕcū-nia= money (chattels)pecus = cattle.
gĕn-us= race, birthgen = to be born.
auspĭc-ium= an omenauspex = a soothsayer.
avis + spicio
gaud-ium= joygaudēre = to rejoice.
lā̆tro-cinium= robberylatro = robber.
auxĭ-lium= helpaugēre = to increase.

(iii.) Nouns denoting acts, or means and results of acts.

-MŌNIA, F.; -MEN, -MENTUM, -MŌNIUM, N.

quĕri-monia = complaint, formed from quĕri = to complain.