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.
champ champy chimp chomp chump shampoo
champ amp chomp champy whomp lamp whump tamp damp samp ramp pampa campy vampy campo vamp campi camp hump hemp gamp chimp chump
cham chammy chemo chimb chime chum chummy chyme sham shame shammy shamoy schmo schmoe