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.
dynasty dynast density dunnest tensity downiest tenacity tanist tannest tennist tiniest toniest
nasty hyponasty dynasty honesty canasta mainstay cineast density dynast tensity