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.
syndic synodic sundeck sundog zoonotic
fundic syndic deontic vanadic maenadic lentic quintic quantic gonidic gonadic cantic mantic anodic bonduc biontic benedick antic monadic ontic enneadic monodic synodic shindig
sand sandy send sned snide sonde sundae sundew synod