pretension vs unnaturalness

pretension and unnaturalness both are nouns.

Word	Noun	Adjective	Verb	Adverb
pretension	Yes	No	No	No
unnaturalness	Yes	No	No	No

As nouns, unnaturalness is a hypernym of pretension; that is, unnaturalness is a word with a broader meaning than pretension:

pretension: the quality of being pretentious (behaving or speaking in such a manner as to create a false appearance of great importance or worth)
unnaturalness: the quality of being unnatural or not based on natural principles

pretension (noun)	unnaturalness (noun)
a false or unsupportable quality	the quality of being unnatural or not based on natural principles
the quality of being pretentious (behaving or speaking in such a manner as to create a false appearance of great importance or worth)
the advancing of a claim