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.
troupes tropes towropes troops tripes trapes drupes drops trappous turps traps tarps trips droops drapes dropsy tripos trapeze traipse hydrops hydropsy trapezia trapezii trappose dorps drips
troupes croupes ropes roups rupees croups gropes groupies groups liriopes hyperopes pyropes drupes towropes tropes
troupe trop troop trope strop stroppy