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.
calix calx calyx calicos calicoes calks culex galax kylix caulks clicks colics galaxy calques cliques cowlicks
calix bollix falx helix calx calyx galax kylix cylix
calico calk calque caulk click clique cliquey cliquy colic colicky