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.
shako shacko shack shake shaky shag shog sheik shock shook shuck shaggy sheikh
shako hack haik hake haku hawk mako wacko whack whacko shack shacko shake shaky
sha shah shaugh shaw shay shea pshaw