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.
frown fern firn ferny frena furan farina ferine fraena furane virion foreign
brown crown drown grown frown drone neurone baron pereon gyron roan morrion morion hereon krona maroon pyrone irone krone heroin barony boron brawn browny durion trone whereon crony hyperon giron kroon prone perron carrion groan neuron moron marron crone drawn diuron irony virion croon groin iron garron corona heron prion prawn trona turion chorion
frow fro faro forwhy froe vrow