outcrop vs outthrust

outcrop and outthrust both are nouns.

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

As nouns, outthrust is a hyponym of outcrop; that is, outthrust is a word with a more specific, narrower meaning than outcrop:

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

Other hyponyms of outcrop include belay.

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

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