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.
pereon pereion perron hyperon prone prion preen pyrone pernio pyrene perinea pirn porn porno porny prawn purin pyran parian pirana purana paranoia
hereon pereon whereon frown maroon morion baron moreen wren carrion roan krone terreen boreen prion drown gyron garron groan grown siren serein treen chirren murein wherein turion irone trone giron pyrene arena neurone heron diuron pereion moron perron barony crone arene warren durion irony careen marron rein crony krona corona green morrion groin crown frena bren hyperon kroon gyrene heroin brown herein prone syren serene pyrone preen barren boron croon drone virion iron neuron trona tureen terrene chorion
pere perea pereia per pareo speer pareu opera pear aper peer puree peerie prey pare peery peri pure perry pyre pier apery pore peeper pree spree