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.
poppets puppets pipets pipettes pipits paupiettes pupates peptize
lappets moppets poppets puppets sippets tappets tippets whippets pets peats poets nepetas pipets repeats
popped poppet pepped pipped pooped poppied pupped puppet