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.
paranoias paranoeas puranas piranas parians pyranose pyrans pornos prawns pruinose porns pirns prions prunus purins prance prunes preens pereons perrons purines pyrenes pyrones hyperons pereions poorness pureness