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.
perron pereon hyperon pereion prone prion pyrone pernio perinea pirn porn porny preen prawn porno purin pyran parian pirana purana pyrene paranoia
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
perry per apery aper purr pier peri pereia pere perea peery peerie peer pear parry parr opera