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