immensity vs largeness

immensity and largeness both are nouns.

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

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

Other hypernyms of immensity include bigness.

immensity (noun)	largeness (noun)
unusual largeness in size or extent or number	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