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.
missy missay miss massy mussy mossy messy mis moss mess muss miso mise mass mosey mousy masse mosso massa miaows mousse mousey miaous mus mos messiah mas maes mice mows mays maws moos mews mesa masa muse mazy moas
hissy missy cissy kissy sissy pussy kiss sassy cuisse gassy noisy piss bioassay miss mussy hussy wiss daisy bossy gneiss lossy bassy assay messy missay essay massy mossy hiss fussy gussy diss wussy