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.
snack snick sneck snaky snuck sneak snake snakey sneaky snag sync sink sunk sank sonic snook sanga scenic seneca senega snaggy zincky sang sing snog snug song sung zinc zonk
snack knack zincky snick sneak snaky snake wryneck maniac linac guanaco kanaka bonnock bannock nock nick neck knock sneck snuck winnock