gravity vs solemnity

gravity and solemnity both are nouns.

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

As nouns, gravity and solemnity are synonyms defined as:

gravity (noun)	solemnity (noun)
a manner that is serious and solemn	a trait of dignified seriousness
a solemn and dignified feeling	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