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.
gursh qursh garish qurush currish grushie queerish crash crush curch creesh grouch grutch currach grouchy
gursh qursh brash resh boorish boarish bearish rushy currish crush rush lurch marsh moorish nourish perish sourish wearish cherish brushy rash fresh qurush harsh girsh crash curch garish queerish frosh brush fairish marish marshy noirish parish poorish trash whorish church