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.
furl farl furrily frill ferly feral frail farle ferula ferrel ferule freely ferial frilly ferlie fairly ferrule ferulae fierily frailly virl viral
burl furl hurl curl knurl nurl purl churl