face of the earth vs existence

face of the earth and existence both are nouns.

Word	Noun	Adjective	Verb	Adverb
face of the earth	Yes	No	No	No
existence	Yes	No	No	No

As nouns, face of the earth and existence are synonyms defined as:

Other synonyms of face of the earth include being, beingness.

face of the earth (noun)	existence (noun)
the state or fact of existing	everything that exists anywhere
	the state or fact of existing