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.
knout knot nut not knotty nowt nota note knit nutty net nod nit neat nett newt nite node nodi nude gnat
knout out not nut nota tout bout gout gouty lout knot note pout pouty rout route nowt shout