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.
ratchets rachets rochets rachides rachitis recheats reshoots
fitchets ratchets rochets sachets hatchets cachets latchets rachets recheats chitchats sheets cheats chits machetes lichts wauchts outcheats wechts chats yachts
ratchet rachet reached retched roached brachet brachiate tracheate tracheid trachyte