entertainment vs diversion

entertainment and diversion both are nouns.

Word	Noun	Adjective	Verb	Adverb
entertainment	Yes	No	No	No
diversion	Yes	No	No	No

As nouns, diversion is a hypernym of entertainment; that is, diversion is a word with a broader meaning than entertainment:

Other hypernyms of entertainment include recreation.

entertainment (noun)	diversion (noun)
an activity that is diverting and that holds the attention	an activity that diverts or amuses or stimulates
	a turning aside (of your course or attention or concern)
	an attack calculated to draw enemy defense away from the point of the principal attack