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.
shads shades shadows chads sheds shoats shiatsu shoddies shittahs shits shots chats shuts sheets shoots shotes shotts shouts shutes shiatzu chateaus
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
shad shade shadow shadowy shady chad shat shed shoat shod shoddy