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.
deeply deploy dopily duopoly duple tepal dapple diploe
deeply reply ply soapily duopoly deploy splay ploy supply sappily repel pily apply replay reapply ropily wheeple choppily ripely play poly ripply pepla tepal dopily sepal peppily roupily paly peepul cheaply byplay nippily loopily hiply happily haply shapely