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.
chads shads chats cheats chides shades chetahs shadows cheetahs chateaus chuddahs chits sheds chotts chutes shoats shiatsu chitties shittahs shoddies
chads shads ads readds heads lades kadis naiads nadas pads gadis gauds cades reads raids sades cads saids dados sheds qaids hods deads ghats tads fads wades hades fados lauds whids maids fades adds shades wads caids hats qadis cadis goads gads rads padis naiades dadas lads quads kneads sadis loads ados mads aids mauds bads meads beads chats woads leads whats wadis roads bawds toads bauds duads jades dads yauds
chad chaeta chaetae chat chateau chatty cheat chid chide chuddah shad shade shadow shadowy shady