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.
hopple hoopla happily haply hiply huipil
fipple hopple popple topple ripple nipple dapple tipple apple supple plew spale ripply pile pale maypole apply maple reapply dipole papule uppile spile duple cupule pole diploe rappel supply pele plea appal appel zeppole couple people plie pule wheeple
hoppy hop happy hippie hippo hippy hoop hoopoe hoopoo hope huppah