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.
travel travail drivel trayful trefoil trivial trevally trivially trifle dareful direful tearful truffle
ravel caravel gravel travel reveal revel bravely carvel gravely grovel marvel surveil drivel shrivel
trave drave teraph trivia trove strafe