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.
condone condign conidian continue contain continua continuo guanidine quinidine canton canteen cantina
undone condone indene intone lindane menadione mundane rundown sundown tendon undine
condo coned conidia connote conoid conto