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.
shawm sham shame shammy shamoy cham shim shmo chammy shimmy chum
shawm ham haem hame wham whamo cham sham shame
shaw sha chaw shah shaugh shay shea shew show showy pshaw