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.
laugher laver laveer leaver loafer louver leafier leavier lifer lever liver lover levier liefer liever livery livier louvre
cougher laugher rougher tougher higher nigher sigher weigher