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.
classes glasses classis clauses glassies closes coulisses colessees glosses galleasses galliasses colossus coleuses glossies cullises calloses calluses callouses glazes clozes calces colzas glaces glasshouse calices calyces culices calesas galluses coalesces gallowses glacis glozes glossas
lasses classes paillasses glasses galliasses molasses palliasses galleasses balases loesses lases liaises coulisses glossies lassoes blisses blesses lassies lassis lessees plusses glassies glosses clauses pleases valses plisses leases bolases lassos flossies flosses colessees malaises aliases classis pelisses losses releases
class classy clause claws clays colas glass glassie glassy