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.
virago virga farrago frag forgo forego verruca verrucae
virago farrago rag trigo drag sargo largo raga ragg brag burgoo aerugo ergo erugo crag grego forego pargo forgo sorgo frag touraco cargo turaco
vair vara vera vier vireo aviary vivaria vivary