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.
palapa palp palpi plop pulp polyp pulpy pileup polypi pullup
palapa lap tilapia leap lipa beleap flap jalap clap culpae culpa kalpa milpa salpa salpae slap dewlap chalupa
pal pally spall papally opal play pilaw pilau pial peal pawl paly pallia paella pall paleae palea pale pail pula papal spale splay