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