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.
smacks smocks sumacs sameks smeeks smokes samekhs sambucas sambukes smogs
macks tombacks smacks umiacks oomiacks umiaks hommocks tombacs makos mammocks tambaks sumacs hammocks comakes jumbucks gimmicks hummocks bemocks macs limbecks remakes umiacs makes tombaks tambacs amucks micks mucks oomiacs mocks rumakis oomiaks smocks shmucks