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.
clack click cloak clock cluck cloaca colicky clag kolacky calk cloacae cowlick coeliac colic kulak klick cleek caulk calico claque kulaki killick killock clog klik colleague colloquia
alack slack plack shellack lack clack flack pollack black lac leak pluck iliac killick heliac block laky clock lake fleck flake flak klick lock bleak luck rollick slake mullock shellac flick shlock relock tilak ileac flock pollock cluck bullock flaky cowlick hillock lick killock coeliac celiac talcky laic kolacky kulak lilac kulaki cloak rowlock slick click lakh shylock
claw clay cola cackle caecal caecally laical laically