I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
prossies prosses prissies proses prisses presses purses prices parses perses prases prizes prosos prises peeresses parises pursues peruses process paresis praises pyrosis piracies precieuse prezes pareses pierces precess precise precious precis
brassies prossies prissies trusses karosses trasses grasses drosses peeresses seeresses grosses crosses prosses presses heresies prisses cuirasses cresses reissues caresses heiresses morasses phoresies reassess frasses brisses brasses wrasses harasses dresses duresses tresses chorusses
prossie pross pros porose praos press priss prissy proas prose proso prosy prows pyros uprose