effusiveness vs expansivity

effusiveness and expansivity both are nouns.

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

As nouns, effusiveness and expansivity are synonyms defined as:

effusiveness and expansivity: a friendly open trait of a talkative person

Other synonyms of effusiveness include expansiveness.

effusiveness (noun)	expansivity (noun)
a friendly open trait of a talkative person	a friendly open trait of a talkative person
	a quality characterized by magnificence of scale or the tendency to expand
	the fractional change in length or area or volume per unit change in temperature at a given constant pressure