Similar to professorius
- proletarius – a citizen of the lowest rank
- professor – authority, expert
- professio – art, craft, declaration, monastic profession of vows, monastic rule, oath of canonical obedience, profession, trade
- professus – having professed monastic vows
- proprius – characteristic, one's own, particular, peculiar, permanent, special
- propitius – favorable, gracious
- promiscuus – commonplace, indiscriminate, mixed, usual