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.
classy class glassy glass claws clays colas clause glossy coalas callas cullays colossi glassie cols colessee galliass coulisse coalless galleass calos culls clues glias coils cowls cloys cools galas gloss colza clews cauls kolas glazy coles close calls coals coleus glossa galeas caules colies cullis calesa koalas caulis coulis galahs callus queleas callees callose collies cullies glossae keyless callous coolies coulees coalesce goalless keelless quillais
glassy classy lass lassi lasso lossy flossy class galleass galliass glass glossy paillasse palliasse palsy