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.
curacoas curacaos croaks cracks carcass caracks carcase cariocas carracks crocs crags crakes crooks crocks crucks cricks cargos creaks cargoes karaokes carks corks grogs groks creeks crocus gregos quarks quirks
curacoas barcas fracas curacaos maracas narcos touracos turacos turacous
curacao curacoa carack crack cracky