Perforce rhymes with:
enforce, force, forse, laforce, reinforce, borse, bourse, coarse, corse, course, divorce, endorse, enforce, ensource, force, forse, gift-horse, hoarse, horse, laforce, midcourse, morse, morss, norse, nourse, outsource, reinforce, remorse, sorce, source, vorce
Perforce sounds like:
paraphrase, perverse, prefers, preparers, prepares, probursa, purifiers, purveyors