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