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.
bossy boss bousy bassy bioassay bos boos boys bass busy boas bios bows buss basso bassi bouse buoys bowse byssi boozy boughs bis bys bus bas bes bowwows bias base buys bays bise bozo baas beys bees
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