Dr. Seuss has a lesser-known book called The Tough Coughs as He Ploughs the Dough (based on the observation that none of these -ough words rhyme -- the /tʌf/ /kɔfs/ as he /plaʊz/ the /doʊ/). (And yes, that's not even all of the sounds that are spelled by -ough, like /-u/ in "through".)
But the best examples are in the poem _The Chaos_ (http://ncf.idallen.com/english.html).
Through, though, throw, tough... I know a trough exists but I have no idea how it's pronounced.