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.
niceties noisettes nasties nauseates knessets nests
niceties societies casettes piosities pasties noisettes nauseates nasties musettes gazettes gaseities cassettes cetes poussettes fossettes beasties sties cities paucities posties raucities cecities caseates rosettes testis