Laughs at exams (5)

I believe the answer is:
mocks
This clue could be a double definition.
'laughs at' is the first definition.
The definition and answer can be both to do with communicating as well as being verbs in their -s form.
Maybe you can see a link between them that I don't see?
'exams' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for mocks that I've seen before include "practice exams" , "Test examinations" , "Ridicules" , "Takes off" , "Scorns" .)
