gravity vs serious-mindedness

gravity and serious-mindedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
gravity	Yes	No	No	No
serious-mindedness	Yes	No	No	No

As nouns, serious-mindedness is a hypernym of gravity; that is, serious-mindedness is a word with a broader meaning than gravity:

Other hypernyms of gravity include earnestness, seriousness, sincerity.

gravity (noun)	serious-mindedness (noun)
a manner that is serious and solemn	the trait of being serious
a solemn and dignified feeling
(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface