gravitate vs gravitation

gravitate is not a noun while gravitation is a noun.

Word	Noun	Adjective	Verb	Adverb
gravitate	No	No	Yes	No
gravitation	Yes	No	No	No

gravitate (noun)	gravitation (noun)
	a figurative movement toward some attraction
	movement downward resulting from gravitational attraction
	(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface

gravitate (verb)	gravitation (verb)
move due to the pull of gravitation
be attracted to
move toward