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.
croquis crocus crocs croaks cricks quirks crocks crucks crooks cargos cargoes crux curacoas cariocas curacaos grogs carks crags grigs corks groks cracks crakes creaks creeks gregos quarks caracks carcase carcass
croquis roques baroques marquis marquise piroques turquois charquis