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.
pileup pullup palp plop pulp polyp pulpy palapa
pileup leap loup beleap bleep julep clepe kelep pullup salep sleep chalupa shlep shlepp
pile pilei pilea pillowy spile pillow pule pill poilu pili plew pilaw pily pial pilau pele paleae palea pale pail plea plie pole spiel spill