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.
pottery potter pottier petter patter putter poetry powter pouter powdery pettier puttier poutier pater peter pewter pitier powder peatier padder
battery littery buttery tottery jittery cattery lottery chattery mattery guttery pottery fatter chatter nitery otter litter knitter netter eatery cottier latter lotter gnattier phatter bitter ratter hotter knotter nuttier fattier dotter butter nettier titer shutter shatter chattier whitter wetter watery petter toter letter quitter tattier tater cautery jitter cotter nutter natter ruttier better fetter potter reutter pottier knottier battier nittier gutter hitter matter cattier getter fitter bootery jotter teary pettier rattier vetter patter cutter rotter batter puttier nattier jettier tetter terry mutter hatter setter ritter putter sitter tatter guttier titter dottier totter utter watter whetter wittier bittier chitter shittier yatter try
pattee potto potty puttee spotty pot