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.
plack pollack pluck plucky pollock plica polka pulik plague plaguy plaque plicae palooka pealike plaguey plug
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
pilau pilaw play plea pula splay