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.
messy mess massy mussy missy mossy missay mews miss mass muss maes moss mesa messiah moues mosey mosso massa masse meous meows mousy mousse mousey mas mos mis mus masa miso muse meze mace moos maze mays moas mazy mice maws mise mows
messy ess fesse hissy hussy gesso jess jesse fussy gassy assay queasy missy mussy ness poesy resay cissy sissy cheesy gussy fess loess massy bossy bioassay bassy guess kissy less easy lossy essay mess missay mossy gneiss newsy pussy cess sassy wussy chess