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.
mashy mash meshy mushy mashie mach mesh mosh mush mache macho match much
ashy mashy washy dashy shy ash dishy poachy wash beachy dash sash rash achy shay bash pasha leash quash meshy bushy mash kasha fishy leachy cushy gnash fash gash mushy gushy pash peachy tushy hash pushy lash rushy sashay dashi deash cash