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.
orcas orcs oryx
barcas orcas rags arecas arcus arcs araks rocs mercs recs gearcase curacaos crags lyrics marcs brags parkas circus darics durocs teargas torics carcass burkas ericas markas frags verrucas virgas carcase cariocas crocs fracas curacoas maracas myricas narcs burqas narcos orcs cercus seracs drags tarocs torcs charkas