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.
powder powdery powter potter pouter padder pewter poetry pottery pottier poutier padre padri pater peter patter petter pitier putter peatier pettier puttier
lewder powder chowder redder padder header tawdry kidder loader reader heder giddier madder bawdry fader leader shader gadder gaudier lader dear codder deer reedier fodder beader budder cheder shudder bedder bidder rider wider weedier rudder wedder wadder needier tidier ceder shedder mudder doddery deedier seder seedier bider cyder powter ruder eider nuder heeder hider redear badder powdery readier beadier bawdier muddier dere ladder ridder lieder faddier gaudery coder aider feeder lauder headier leadier kneader judder raider pewter nodder louder adder cider hoodier needer seeder sadder doer deader odder dowdier rudery moodier voider ruddier wader guider weeder widder dodder woodier chider tedder chudder udder shadier shoddier rowdier shuddery
pod podia pood apod epode spode