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.
chimp champ chomp chump champy shampoo
chimp imp chomp wimpy limpa champ wimp whump whomp simp guimpe pimp hump jimpy hemp jimp gimpy gimp impi limp chump
chimb chime cham chammy chemo chum chummy chyme shim shimmy schmo schmoe