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.
artier arider artery ardor ardour
rattier groutier prettier partier dirtier ruttier grottier quartier courtier purtier chertier carrotier troutier artier shirtier grittier brattier rootier heartier fruitier tartier wartier frettier lowrider grouter artery ferreter retear router greater barter braider rotter carter crater rioter frotteur prater irater trotter cruddier greeter rooter porter rater wordier ureter treater arider tardier derider sorter charter garotter parroter nerdier rider quarter frater garroter horrider pearter curter cowriter portiere grodier garter rowdier broodier tarter fretter ritter ratter writer retire ruddier greedier joyrider grater gritter bruiter curdier fruiter krater fritter broider hurter raider lardier readier reutter critter courter reedier barrater perter rewriter darter hardier torrider triter brighter narrater charioteer shorter
art airt aorta aortae arete arid arietta ariette aroid arty