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.
gushiest cushiest gashest gauchest catchiest
shiest dashiest mushiest botchiest patchiest witchiest cushiest techiest touchiest itchiest peachiest rushiest achiest pushiest gushiest beechiest ashiest poachiest catchiest bitchiest bushiest washiest meshiest beachiest tetchiest pitchiest reechiest fishiest chichiest leachiest dishiest pouchiest richest lushest tachiste poshest gauchest chest tachist rashest chesty shist gashest schist