mental rejection vs skepticism

mental rejection and skepticism both are nouns.

Word	Noun	Adjective	Verb	Adverb
mental rejection	Yes	No	No	No
skepticism	Yes	No	No	No

As nouns, mental rejection and skepticism are synonyms defined as:

Other synonyms of mental rejection include disbelief, incredulity, scepticism.

mental rejection (noun)	skepticism (noun)
doubt about the truth of something	doubt about the truth of something
	the disbelief in any claims of ultimate knowledge