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.
pastry paster pastor pastier pasture piaster piastre pester poster pestier posture
vestry wastry pastry juster ester stray lister lustra keister castor fester star vaster quester costar maestri heister boaster pastor laster coaster oyster hoister jesuitry bistro kiester bistre shyster wester daystar zester wastery sistra waister tester piastre duster diaster master booster bister ristra pester wrester moister roster rouster buster roister nestor raster mystery meister baster mastery keester stir foster keyster ouster history jouster story faster astray astir leister quaestor luster paster estray jester maestro lustre waster stroy feaster sister xyster aster muster poster caster roaster mister rostra rooster royster questor nester bestir coster zoster easter destroy diester piaster taster toaster gaster chaster rester yester
past paste pastie pasty pasta pst postie post pistou pesty paused pesto pest passed passado passade psst piste