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.
gussy guess gauss gassy gussie guys cuss gawsy kissy guise quass gauzy goosy cusso kusso causey cuisse kousso goosey queasy gas gos quassia gays kues goos kiss gaes goys goes goas coss koss cosy cues
fussy pussy gussy wussy mussy hussy guess bousy massy assay missay bossy bassy mousse causey muss kissy essay puss cissy sissy wuss lossy busy mossy bioassay hissy mousy mousey missy messy buss gauss lousy fuss gassy cusso cuss quass sassy suss kusso kousso