outcropping vs rock outcrop

outcropping and rock outcrop both are nouns.

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

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

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

Other synonyms of outcropping include outcrop.

outcropping (noun)	rock outcrop (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