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.
recs recks wrecks recuse regs rocs rocks recce rakes rykes reeks racks rucks ricks rakees rekeys wreaks wracks roques wricks ruckus rogues rex raucous reggaes raggies raggees rickeys rookies rags rigs rugs ragas raggs rakis rakus rooks