rock outcrop vs outcropping

rock outcrop and outcropping both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock outcrop	Yes	No	No	No
outcropping	Yes	No	No	No

As nouns, rock outcrop and outcropping are synonyms defined as:

rock outcrop and outcropping: the part of a rock formation that appears above the surface of the surrounding land

Other synonyms of rock outcrop include outcrop.

rock outcrop (noun)	outcropping (noun)
the part of a rock formation that appears above the surface of the surrounding land	the part of a rock formation that appears above the surface of the surrounding land