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.
shawn shewn shown shanny shun shin shanghai shone shiny chain sheen shoon shine choana chaine shinny sheeny choanae sheeney sheenie shinney chin chon
shawn awn shown mawn chain hwan tawny dawn sawn pawn awny gnawn lawny lawn hewn haen fawny fawn shewn yawn
shaw sha chaw shah shaugh shay shea shew show showy pshaw