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.
porno porn porny pernio pirn paranoea paranoia preen prion prone prune prawn pyran purin parian pereon perron pirana purana purine pyrene pyrone hyperon pereion perinea
porno corny shorn worn sorn porny porn mourn morn merino marrano lorn loran korun born borne corn journo horny horn bourn boron moron pernio cornu serrano torn shoran yourn
poor poori pore pour aporia spore