sobriety vs gravity

sobriety and gravity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sobriety	Yes	No	No	No
gravity	Yes	No	No	No

As nouns, sobriety and gravity are synonyms defined as:

Other synonyms of sobriety include graveness, soberness, somberness, sombreness.

sobriety (noun)	gravity (noun)
abstaining from excess	a manner that is serious and solemn
a manner that is serious and solemn	a solemn and dignified feeling
moderation in or abstinence from alcohol or other drugs	(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface
the state of being sober and not intoxicated by alcohol