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.
whitens whiteness wheatens widens witans witness witneys whatness wideness wittiness wetness weediness woodiness woodenness
whitens tens seitans latens potteens pitons patens maidens catenas neatens sateens lateens quietens kittens ketenes tautens steins widens chitins shaitans wheatens lattens rattens battens teens ratteens poteens pattens mittens luteins nitons retenes dienes tense butenes fattens titans stenos heightens hoidens witans chitons sheitans