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.
coattend catenoid cottoned ctenoid catenate ctenidia kittened coadunate cadent quotient quietened
attend coattend tend tautened teind tendu attent battened fattened heightened kittened latened mittened neatened pattened rattened quietened whitened