Earth's surface vs gap

Earth's surface and gap both are nouns.

Word	Noun	Adjective	Verb	Adverb
Earth's surface	Yes	No	No	No
gap	Yes	No	Yes	No

Earth's surface (noun)	gap (noun)
the outermost level of the land or sea	an act of delaying or interrupting the continuity
	a narrow opening
	a conspicuous disparity or difference as between two figures
	a difference (especially an unfortunate difference) between two opinions or two views or two situations
	an open or empty space in or between things
	a pass between mountain peaks; geomorphological term for the lowest point on a mountain ridge between two peaks

Earth's surface (verb)	gap (verb)
	make an opening or gap in