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.
negus negs neuks nags nogs necks noggs nukes nocuous nookies nixe
negus eggs segos rogues pegs neuks magus negs agues leagues aqueous begs bogus ecus teguas teggs yeggs segues guys fugues kegs rugous regs peags queues legs megs kagus gigues egos vogues vagus fugus tegs degas togues segs yeuks