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.
maintain mountain mountainy montane monotone monotony menadione muntin
fountain maintain mountain contain quintain mountainy dentine montane suntan quintan pintano fontina muntin quintin intine pentane lantana pontine kinetin dentin cantina tontine
mint manat manatee manito manitou manitu manta manteau mantua meant minty minute