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.
speaned spanned spawned spend spendy spined spooned spent spinet sapient spondee spinto spinate spinout
speaned pained deepened spawned spanned ripened repand reopened opened lippened happened paned penned peined peened pawned panned japanned cheapened