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.
roques rogues rugous rookies raucous regs rugs recs rocs roux recks rocks reeks rakes rooks rakus rykes rucks wreaks recuse rekeys rugose rugosa ruckus rakees wrecks raggees raggies reggaes rickeys rex
caiques fiques piques cheques tuques toques roques cukes ukes queys leagues dukes pukes aquas cues guess kues queues agues gigues rogues jukes maquis segues vogues togues nukes magueys fugues