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.
sneap snap snappy snip snipe snoop sunup sannop sannup snippy snoopy senopia sinopia sinopie
neap sneap nap knap napa nape neep canape lineup snap tuneup
sane sene sine sinew sinewy snaw sone syne esne season usnea