extensiveness vs largeness

extensiveness and largeness both are nouns.

Word	Noun	Adjective	Verb	Adverb
extensiveness	Yes	No	No	No
largeness	Yes	No	No	No

As nouns, extensiveness and largeness are synonyms defined as:

extensiveness and largeness: large or extensive in breadth or importance or comprehensiveness

extensiveness (noun)	largeness (noun)
large or extensive in breadth or importance or comprehensiveness	the property of having a relatively great size
	large or extensive in breadth or importance or comprehensiveness
	the quality of being pretentious (behaving or speaking in such a manner as to create a false appearance of great importance or worth)
	the capacity to understand a broad range of topics