make-believe vs simulation

make-believe and simulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
make-believe	Yes	Yes	No	No
simulation	Yes	No	No	No

As nouns, simulation is a hypernym of make-believe; that is, simulation is a word with a broader meaning than make-believe:

Other hypernyms of make-believe include feigning, pretence, pretending, pretense.

make-believe (noun)	simulation (noun)
the enactment of a pretense	the act of giving a false appearance
imaginative intellectual play	the act of imitating the behavior of some situation or some process by means of something suitably analogous (especially for the purpose of study or personnel training)
	representation of something (sometimes on a smaller scale)
	(computer science) the technique of representing the real world by a computer program

make-believe (adjective)	simulation (adjective)
imagined as in a play