exaggeration · noun C or U /ɪgˌzædʒ.əˈreɪ.ʃən/
exaggeration
C1 when you describe something as larger, better, worse, etc. than it really is
Dictionary example:
a slight/gross exaggeration of the facts
Learner example:
You wrote about "a sudden downpour of rain" which was a huge exaggeration. (Certificate in Advanced English; C1; Swedish)