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.
raggs rags raggees raggies ragas rigs rugs regs reggaes rakes rakis rakus racks rakees rogues rugose rugous wracks wreaks raucous rax recs rocs
raggs jaggs ags magus ragas zags sagos rags peags vagus lags quaggas noggs agas bags muggs dagos tags wags yags eggs fags vuggs nags teggs hoggs mags daggas sags hags sagas dags haggis shags quags miggs kagus gags jags gigs iggs yeggs
ragg raggee raggy rag raga reggae brag braggy frag crag craggy drag draggy