expansivity vs magnificence

expansivity and magnificence both are nouns.

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

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

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

Other hypernyms of expansivity include grandness, impressiveness, richness.

expansivity (noun)	magnificence (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	splendid or imposing in size or appearance
the fractional change in length or area or volume per unit change in temperature at a given constant pressure