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