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.
croon crown kroon crone crony krooni corona carrion corn carn coronae curn cairn groin groan cornu corny krone grown carny krona crane cranny carina curran crania cornua garron cornea cairny carnie groyne carney careen carinae coreign gran grin karn kern kirn
croon kroon maroon drone durion prion pyrone neurone pereon roan giron morrion morion groin whereon hereon crone carrion irony gyron irone iron heron heroin baron trone boron frown crony virion barony grown krona moron marron garron brown krooni corona groan crown krone neuron hyperon perron prone diuron drown trona turion chorion
cooer crow cooker cookery rookery rookier