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.
flushes flashes fleshes filches fleches fleeches fletches flitches
lushes slushes blushes plushes flushes flashes bolshies sloshes calashes relishes lashes leashes plashes fleshes clashes polishes galoshes slashes goloshes slouches goulashes welshes
flush flash flashy flesh fleshy fluish