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.
maracas marcs markas myricas markkas margays marks mercs marques marquis marquees marquess marquise merks mirks murks morgues
fracas maracas triacs touracos reracks myricas curacaos barcas curacoas cracks ragas wracks arecas arracks racks carracks ericas verrucas hayracks gearcase caracks carcase carcass barracks orcas seracs tracks turacos