Sure Bets:
| -ā | (1st declension) ablative singular |
|---|---|
| -am | (1st declension) accusative singular |
| -ārum/-ōrum | (1st/2nd declension) genitive plural |
| -ās / -ōs | (1st/2nd declension) accusative plural *-tās nominative singular feminine 3rd declension, abstract noun suffix. [*-os, short “o,” archaic (original) ending of some -or nouns, e.g. honos = honor] [* 3rd declension noun ōs (ōris, neuter) mouth] [* 3rd declension noun os (ossis, neuter), short “o,” bone] |
| -em | (3rd declension masculine/feminine) accusative singular *quem accusative singular masculine pronoun [*indeclinable numbers: septem, novem, decem] |
| -er | (2nd / 3rd declension) nominative singular masculine [*māter, feminine] [*-(i)ter adverb from 3rd declension adjective) |
| -men | (3rd declension) neuter nominative / accusative singular (e.g. nōmen, flūmen) |
| -ius / -īus | Pronoun or “pronoun” declension adjective genitive singular (cuius, eius, huius, illīus, ūnīus, etc.) |
| (-)id / -ud | Neuter Pronoun nominative / accusative singular (id, quid, illud, aliud, etc.) |
