greatness vs largeness

greatness and largeness both are nouns.

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

As nouns, largeness is a hypernym of greatness; that is, largeness is a word with a broader meaning than greatness:

Other hypernyms of greatness include bigness.

greatness (noun)	largeness (noun)
the property possessed by something or someone of outstanding importance or eminence	the property of having a relatively great size
unusual largeness in size or extent or number	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