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.
preen pyrene pereon pirn porn pereion prune prion porny prawn purin pyran porno prone pirana parian pernio purana purine perron pyrone hyperon perinea paranoea paranoia
boreen careen treen preen moreen green terreen tureen rein pereon greeny siren warren hereon serein terrene whereon barren arene herein bren murein wherein frena serene pyrene arena wren gyrene syren chirren
pree pere speer pareo pareu peer peerie peery pare pereia perea pore prey pure puree pyre peeper spree