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.
brush brushy brash brashy bearish boarish boorish barouche birch brach broach broche brooch breach breech brachia brioche birrotch
brush crush rush qurush whorish trash poorish gursh parish boorish noirish currish marshy resh marish queerish bearish qursh rash fairish boarish harsh wearish sourish perish fresh nourish moorish rushy frosh marsh garish brushy brash crash girsh cherish