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.
carps carpus corps craps crops cripes croups crepes creeps corpus crapes corpse croupes carapace croupous crappies croppies creepies gorps grips grapes gripes gropes groups kreeps grappas grippes groupies
harps carps warps tarps sharps preps carpus larrups reaps raps rapes crapes rips chirps wraps herpes crops sirups dorps drips trapes trips urps props sarapes fraps hydrops serapes reps perps priapus corpse corpus craps gorps corps burps grapes rewraps turps syrups drapes drops grips bewraps traps chirrups sherpas
carp carpi crap crape crappie crappy crepe crepey crepy cripe crop croppie scarp