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.
chump champ chimp chomp champy shampoo
whump hump chump ump chimp hemp chomp jump champ lumpy jumpy whomp bumpy humpy mump lump tump pump rump sump dump dumpy bump
chummy chum cham chammy chemo chimb chime chyme schmo schmoe