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.
sissy sassy cissy sis sass suss seis sizy seise xis sos cis sows says sous saws sues sice cess sees seas sews size syce soys
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
sissy sis tissuey diss missay seise seis sassy sass cissy piss missy hiss miss kissy kiss issue issei hissy suss tissue wiss