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.
mercs marcs merks maracas myricas marks mirks murks markas margays markkas marques marquis morgues marquees marquess
mercs bergs torics tarocs drecks zerks circus perks orcas narcos marcs lyrics crocs jerks ergs berks barcas recks arecas arcus arcs wrecks rocs recs merks narcs orcs cercus seracs darics durocs torcs yerks