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.
plopped palped pulped pleopod polyped palpate polypod polypide polypody polypoid pulpit
lopped plopped clopped flopped slopped glopped lapped walloped blooped dewlapped looped sloped louped slapped flipped galloped galoped clapped lolloped blipped flapped loped slipped lipped clipped dolloped eloped shlepped