Punishment of a Wordy Kind

Harry and Ron got a week's detention with Snape after he wrongly accused them of pulling a prank that Pevees had actually pulled. Snape decides that rather than make them scrub cauldrons he would try a punishment Headmaster Dumbledore had told him about, involving a muggle dictionary. Apparently it worked wonders for muggle children will it work on the two Gryffindors?