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.
neat net newt gnat nett netty natty knead gnatty nut nit not knot nude nide nota note need knit nowt nada node nite kneed knout naiad neddy needy nitty nudie nutty
beat eat feat heat meat neat peat seat teat wheat cheat at et