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.
gorps corps grips gripes corpus groups corpse grapes gropes grippes grappas groupies crops craps carps crapes carpus cripes creeps crepes croups kreeps croupes crappies creepies croppies croupous
corps dorps gorps crops perps raps groups liriopes ropes roups sirups pyropes preps croups craps wraps corpus droops dropsy hydropsy towropes trips tropes urps chirps sharps grips burps reps fraps warps traps troops hydrops tarps drips drops harps larrups rips turps syrups chirrups rewraps props preops gropes hyperopes bewraps corpse carpus carps herpes sherpas
gorp grape grapey grappa grapy grip gripe gripey grippe grippy gripy grope