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.
mossy moss missy mosey mussy massy mosso mousy messy mos mousey missay mousse mess mows miss moos moas muss mass mouse moose masse massa moues meous meows miaous miaows mis mas mus messiah masa mazy muse maes mays mesa miso mise maws mews mozo
bossy mossy lossy cissy sissy posse pussy nosey ossa fossa mussy loess lousy hussy hosey choosey hissy moss missy messy fussy cosey koss loss gussy goosey cosy toss assay coss bioassay gassy massy essay fosse goosy joss foss mosso mosey missay boss kissy bassy bousy mousy noisy nosy poesy posy rosy sassy doss wussy choosy