?? “…all words should actually be in the nom[inative]”.
That’s close but not quite true. To learn a word, you need to learn to learn all its cases (forms). Luckily, most words are regular, so once you learn the root of the word and what declension (nouns, pronouns, adjectives) or conjugation (verbs) the word is
in, you can figure out what all the forms are.
For example, the word dominus (lord) is a masculine noun of the second declension, so here are the forms for it:
The root here is “domin”, so you add the suffixes to form the various cases.
Nominative (subject): Dominus dicit - The lord says
Genitive (possessive): canis domini - the lord’s dog
Dative (indirect object): Do aurum domino - I give gold to the lord.
Accusative (direct object): Amo dominum - I love the lord.
Ablative (by which, object of some prepositions): Hic factus est a domino - This was done by the lord.
Vocative (address): Domine, audi me. - Lord, hear me.
…trying to keep this simple. We don’t learn this all in one day.
Trivia note for the day: “prius” is actually a Latin word, so the plural (which people have been arguing about) is “priora”. It basically means the same as English “prior”.
–R. S. van Keuren