gravimeter vs gravity meter

gravimeter and gravity meter both are nouns.

Word	Noun	Adjective	Verb	Adverb
gravimeter	Yes	No	No	No
gravity meter	Yes	No	No	No

As nouns, gravimeter and gravity meter are synonyms defined as:

gravimeter and gravity meter: a measuring instrument for measuring variations in the gravitational field of the earth

gravimeter (noun)	gravity meter (noun)
a measuring instrument for determining the specific gravity of a liquid or solid	a measuring instrument for measuring variations in the gravitational field of the earth
a measuring instrument for measuring variations in the gravitational field of the earth