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.
regs rags recs rugs rigs reggaes reeks ragas rykes recks rakes raggs recuse rekeys rogues wreaks rugosa rugous wrecks roques rakees rex raggies raggees rookies rickeys rocs ricks rocks rooks rucks racks rakis rakus recce
begs kegs legs megs negs pegs regs segs tegs