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.
augur augury agar agger aggro agora agree agria agorae aquaria acre
augur vigour rigour guar guru augury figure vaguer gaur jaguar voguer cougar leaguer ligure liqueur maugre muggur sugar