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.
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marshy brash marish qursh currish gursh rush rushy crash boarish bearish boorish diarchy poorish trash parish wearish noirish cherish brush resh rash fresh qurush queerish crush garish harsh frosh girsh fairish brushy brashy sourish perish torchy nourish trashy moorish whorish marsh churchy
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