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.
sneck snack snick sneak snuck seneca sneaky sank sync sink sunk snook snake snaky sonic scenic senega snakey zincky sang sing snag snog snug song sung zinc zonk
neck sneck wryneck zincky knack knock neuk nick nock bannock bonnock seneca snack sneak snick snuck fennec winnock
sane sene sine sinew sinewy sone syne esne usnea