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.
sheeter cheater shedder shutter shooter shatter shouter shittier cheder shader shadier chitter chatter shudder chattier shoddier shoetree shuddery chattery chider cheddar chowder chudder
meeter teeter sheeter heeder seater better meter neater netter feeder pewter setter feater dieter fetter deter tetter wetter cheater eater peter hetero neuter getter quieter letter meteor vetter needer petter heater retear vetoer weeder whetter metier beater seeder