expansivity vs grandness

expansivity and grandness both are nouns.

Word	Noun	Adjective	Verb	Adverb
expansivity	Yes	No	No	No
grandness	Yes	No	No	No

As nouns, grandness is a hypernym of expansivity; that is, grandness is a word with a broader meaning than expansivity:

expansivity: a quality characterized by magnificence of scale or the tendency to expand
grandness: splendid or imposing in size or appearance

Other hypernyms of expansivity include impressiveness, magnificence, richness.

expansivity (noun)	grandness (noun)
a friendly open trait of a talkative person	the quality of being magnificent or splendid or grand
a quality characterized by magnificence of scale or the tendency to expand	unusual largeness in size or extent or number
the fractional change in length or area or volume per unit change in temperature at a given constant pressure	splendid or imposing in size or appearance
	a prominent status