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.
garron carrion groan grown garni groin groyne guarani guarana karn grin carn gran green croon krona carny kroon grana crony cairn krone crown crone grain corona carina curran grainy cairny careen gurney carnie granny carney greeny krooni carinae coronae grannie greenie
garron marron perron durion trone sierran drone baron prone heroin virion crown irone irony hereon chirren giron crony corona groin iron roan moron neuron hyperon gyron krona warren barren grown frown brown pereon groan krone heron curran barony carrion crone croon kroon boron maroon morion morrion neurone prion pyrone diuron drown trona turion whereon chorion
gar carr carry gaur guar gurry karroo agar