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.
boarish bearish boorish brash brush brushy broach brashy brioche barouche birch brach breach breech broche brooch brachia
bearish wearish boarish parish marish garish marshy whorish fairish sourish marsh perish rishi orisha noirish boorish harsh currish moorish poorish nourish queerish cherish