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.
sippets septs spats spits spots spouts spades spaits spates speeds spites spodes sapotas sapotes sopites speedos spitz spuds
lappets moppets poppets puppets sippets tappets tippets whippets pets peats poets nepetas pipets repeats
sipped sippet sapped siped sopped supped zipped