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.
grips gripes grippes gorps grapes groups cripes gropes grappas groupies craps crops corps carps crepes croups corpse carpus creeps corpus crapes kreeps croupes crappies creepies croppies croupous
rips drips grips trips chirps tarps harps ripes cripes euripus larrups gorps burps preps sharps bewraps crops hydrops syrups craps traipse tripes reps urps wraps sirups perps props turps traps gripes raps drops rewraps fraps chirrups tripos warps dorps herpes corpus corpse corps carpus carps sherpas
grip gripe gripey grippe grippy gripy cripe gorp grape grapey grappa grapy grope