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.
harassed hearsed horsed horste hirsute hairiest heroized hoariest horst hurst
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
harass haars hairs hares harissa hears hearsay hearse hoars hoarse horas