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.
champy champ chimp chomp chump shampoo
campy vampy champy amp gamp hempy champ tamp damp ramp lumpy mopy bumpy vamp jimpy humpy wimpy lamp jumpy pampa camp samp campi dumpy campo gimpy
cham chammy chemo chimb chime chum chummy chyme sham shame shammy shamoy schmo schmoe