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.
nocuous nocks nooks knocks nookies nogs necks negus neuks nicks noggs nukes knacks nicoise
vacuous nocuous aqueous fucous mucous raucous rugous scouse soukous dioicous cos