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.
smock smack smoke smoky smokey smog samek smeek sumac samekh smoggy sambuca sambuke smug
bemock hummock hommock hammock mammock mock smock moc moke smoky hummocky smack gimmick mack amuck mick muck smoke amok shmuck