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.
deploy deeply diploe dopily duopoly duple tepal dapple tapalo tupelo
deploy ploy ply happily ropily duopoly diploe supply haply deeply ripely choppily splay sappily replow reapply nippily loopily hiply tupelo poly byplay peppily replay dopily apply roupily ripply reply pily pillowy soapily play plow polo paly tapalo cheaply shapely