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.
snacker snakier sneaker snicker sneakier snickery sinker snooker snaggier sangar snigger snugger sangaree sinecure snuggery snuggerie sangria zingara zingare zingari zingaro
knacker snacker tanker danker snicker sneaker ranker panickier monicker lanker canker gennaker finnickier hanker finickier banker nicker necker knocker knackery snakier sneakier snickery donnicker wanker
snack snake snakey snaky sneak sneaky sneck snick snuck