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.
cupolas cupels copulas couples cupules copals capless gapless keypals
cupolas pols dipoles spools splays plays pleas poles polis polls polos pools polys byplays hooplas copulas maypoles replays repolls spoils zeppoles whooplas
cupola couple cupel cupula cupulae cupule