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.
cats coats cates coatis qats gats cots kats cuts cads catties coatees caids cades cutes coots cotes katas gates goats cadis cutis codas gaits cutesy cottas coitus cuteys caddis cuties cutesie caddies cutties gateaus cooties codeias goatees kits cuds gads gaieties guts cods goads quads gouts qaids coeds gadis gauds kotos kadis gutsy keets kites kytes qadis codes quits
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