The same suffixes—ārius, tōrius, and sōrius—that formed a number of adjectives in this post can also be put to use as nouns with a regular range of meanings. This meaning is often restricted to the gender of the noun formed. Again, these denote a kind of belonging.
-ārius (m.) employee in a particular field
argentārius, -ī silversmith, broker
coriārius, -ī leather worker
Corinthiārius, -ī Corinthian bronze worker (for those not in the know, Corinthian bronze had Gucci bag status in antiquity)
mirābiliārius, -ī miracle worker
operārius, ī worker, day-laborer
-ārius (f.) thing associated with a particular field
aerāria, -ae copper mine
argentāria, -ae bank
arēnāriae, -ārum sandpits (arēna, sand)
Asināria, -ae the play The Ass (with fabula, -ae implied)
-ārium (n.) thing (often a place) associated with a field
aerārium, -ī treasury
tepidārium, -ī warm bath
sūdārium, -ī towel
salārium, -ī salary
calendārium, -ī notebook (calendae, calends)
-tōria / -sōria (f.) and -tōrium / -sōrium (n.) thing (often a place) associated with a field
Agitātōria, –aeThe Driver by Platus (agitātor, driver, with fabula, -ae implied)
The adjectival suffixes -ārius, -tōrius, and -sōrius denote belonging to a group qualified by the implied content of the correspond root. Effectively, these adjectives are formed by the addition to -ius to theadjectival root -āris or the nominal root -or. Let’s build a few examples.
A few things to notice about this pattern: (i) the original base of the adjective can be just about anything—noun, adjective, verb, adverb—but the penultimate word is always a noun or an adjective. That said, (ii) the penultimate noun or adjective is not always extant in Latin; note the [brackets]. Finally, note that (iii) this set of adjectives is often theoretical—rēs bellatōriae (matters of warriors)and rēs extrāriae (matters of foreigners) probably cover half the total appearances of those two adjectives.