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.
bluish blueish blush bullish bolshy bolshie belch bleach blotch blotchy
bluish fluish dullish delish slush polish lush blueish blush bullish flush foolish ghoulish hellish coolish mulish owlish palish plush plushy relish slushy dollish tallish