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.
carcass carcase cariocas caracks carks curacoas carracks crocs crucks cargos cricks crocks crocus cracks cargoes karaokes carex crags corks crakes creaks creeks croaks crooks quarks croquis
carcass arecas barcas ericas fracas verrucas gearcase carcase maracas myricas orcas percuss