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.
glassy glass glossy classy glassie glazy glias class galas gloss galliass galleass galeas galahs glossa glossae guls gals goalless claws glues glace gulls gaols galls glows glees colas kolas gales gleys gules glaze clays goals koalas coalas callas guiles clause gallus gulleys queleas goalies gallies cullays keyless gullies gallows colossi gallous galleys coalless colessee coulisse keelless quillais
glassy classy lass lassi lasso lossy flossy class galleass galliass glass glossy paillasse palliasse palsy