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.
apply appal appel apple appall appeal appellee apollo
reapply ripply supply apply ply ploy rappel fipple popple replay haply happily ropily roupily hiply soapily supple appel dapple deploy duopoly topple choppily nipple byplay splay hopple play pily paly loopily apple reply peppily ripely appal ripple nippily sappily poly deeply dopily tipple cheaply shapely