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.
glasses glassies glosses classes galliasses galleasses glossies glaces glazes classis clauses glasshouse galluses colessees coulisses gallowses glacis closes glozes glossas colossus calloses cullises calluses coleuses callouses calces clozes colzas calesas calices calyces culices
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
glass glassie glassy class classy galas glias gloss glossa glossae glossy