Joke, jest (4)
I believe the answer is:
jape
I believe this is a double definition.
'joke' is the first definition.
(I know that joke can be written as jape)
'jest' is the second definition.
(synonyms)
(Other definitions for jape that I've seen before include "Lark" , "Jolly wheeze" , "Kid" , "Practical joke, jest" , "Trick or prank" .)