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.
grassed greased grossed graced grazed cuirassed groused creased crossed caressed crosshead cursed crazed coursed cresset cruised caroused grisette crosstie grist corset cruset coerced cristae crusade crusado cruzado goriest
harassed cuirassed grassed brassed rased trussed reissued dressed arrased prissed braised praised erased grossed raised phrased hearsed parsed caressed pressed creased reraised crossed tressed greased chorussed
grass grassy crass grays grease greasy gross