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.
whits whites wits whiteys whities wites waits whats whids whets wheats wats wets whidahs wots wides watts wadis weets wadies widows waddies whydahs widdies woodies wads weds
hits whits shits chits its kits gaits rites mites litas quits raitas doits boites wits aits heights hats phuts bahts mitts bitsy zits shots pits writs sites situs suits ditas dits ghats pitas titis toits whats whids gits phots whets knits gites bites baits fiats huts bitts fits hots wites coitus kites quiets quoits lits bits mitis nits nites hets waits tits duits ditsy diets whites zitis suites sits cites writes riots chats dites shuts
white whit whitey whity wit wait what whet whid whidah wite witty twit