pretending vs simulation

pretending and simulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
pretending	Yes	No	No	No
simulation	Yes	No	No	No

As nouns, pretending and simulation are synonyms defined as:

Other synonyms of pretending include feigning, pretence, pretense.

pretending (noun)	simulation (noun)
the act of giving a false appearance	the act of giving a false appearance
	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