outthrust vs outcrop

outthrust and outcrop both are nouns.

Word	Noun	Adjective	Verb	Adverb
outthrust	Yes	No	No	No
outcrop	Yes	No	Yes	No

As nouns, outcrop is a hypernym of outthrust; that is, outcrop is a word with a broader meaning than outthrust:

outthrust: an outcropping of rock that extends outward
outcrop: the part of a rock formation that appears above the surface of the surrounding land

Other hypernyms of outthrust include outcropping, rock outcrop.

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

outthrust (verb)	outcrop (verb)
	appear on the surface, come to the surface on the ground