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.
butyrous butters buttress butteries biters baiters batters beaters betrays betters boaters budders bettors bitters boudoirs batteries booteries biders
butyrous hydros hydrous torous tyros vitreous goitrous nitrous notorious odorous petrous citreous citrous