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.
tripes trips tropes trapes tripos troupes traipse drips turps tarps traps towropes troops drupes drapes trapeze trappose trapezia trappous trapezii dorps drops droops dropsy hydrops hydropsy
cripes gripes tripes ripes tropes herpes croppies traipse towropes trapes harpies crappies grapes chirps drips creepies groupies grips hyperopes pyropes serapes tripos crepes crapes liriopes ropes rupees frappes rappees drapes rips sarapes troupes preppies trips drupes euripus gropes croupes grippes rapes sharpies
trip tripe trippy drip drippy tarp trap trop trope atrip strip stripe stripy