lampoon: verb: Publicly criticize (someone or something) by using ridicule or sarcasm.

I knew lampoon had something to do with criticism, so I checked the box, but I had no idea that the definition specified a public context. Does that mean I didn't know the word?

I suspect a problem with the test is that it's easy to know enough to figure out the gist of a word's definition without having any knowledge of the specificity of the definition, if that makes any sense.