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.
rats ratos rates riatas reatas raitas rads ruts rets rots roads rotes reads rotas raids writs rites roots riots rotos rotis routs writes radius retuse redias reties routes readds rottes radios roadies riotous readies roadeos rods rids ritz reds rides ritzy rodes roods redds redes rudds redos reeds
bats hats seats peats oats gnats lats meats goats kats gats coats cats heats wheats wats cheats tats vats beats qats teats doats rats pats neats mats moats ghats boats eats fats feats fiats chats whats shoats