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.
dashi dash dashy deash dish dacha dishy datcha tushie tach tosh tush
dashi ash wash deash kasha rash pash bash fash hash heishi cash gash ashy roshi quash leash mash mashie mashy gnash pasha rishi sash dash lash sushi dashy tushie washy