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.
shyster chaster chestier
keyster xyster shyster oyster royster roaster chestier jouster foster coster baster mister booster bister easter kiester juster wester gustier pester steer tastier meister lister zestier laster vastier gaster keister rouster yeastier waster dustier daystar boaster paster moister rustier mustier testier diester rooster master caster piaster aster raster ghostier nastier ouster toastier stere hastier chaster keester bustier wrester zoster masseter mastery tester wastery duster visiter luster buster hoister jester vaster nester quester roster lustier heister mystery fustier wristier coaster rester waister poster pestier pastier leister roister faster missteer ester feaster toaster muster feistier sister mistier fester zester diaster taster austere yester