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.
missays misassay misses missus massas missis missies masas misos mises mesas messiahs mosses messes masses miosis moseys mioses misuse musses meioses misease mousses masseuse muses maizes mouses meiosis
assays bioassays essays missays says assais fossas cassias quassias lyssas massas misassay naysays resays tussahs
missay miss massa missy amiss mis