Earth vs terrestrial

Earth is a noun but terrestrial is not a noun.

Word	Noun	Adjective	Verb	Adverb
Earth	Yes	No	No	No
terrestrial	No	Yes	No	No

Earth (noun)	terrestrial (noun)
the abode of mortals (as contrasted with Heaven or Hell)
the 3rd planet from the sun; the planet we live on

Earth (adjective)	terrestrial (adjective)
	operating or living or growing on land
	of or relating to or inhabiting the land as opposed to the sea or air
	of or relating to or characteristic of the planet Earth or its inhabitants
	of this earth
	concerned with the world or worldly matters