upthrow vs upthrust

upthrow and upthrust both are nouns.

Word	Noun	Adjective	Verb	Adverb
upthrow	Yes	No	No	No
upthrust	Yes	No	No	No

As nouns, upthrow and upthrust are synonyms defined as:

upthrow and upthrust: (geology) a rise of land to a higher elevation (as in the process of mountain building)

Other synonyms of upthrow include upheaval, uplift.

upthrow (noun)	upthrust (noun)
(geology) a rise of land to a higher elevation (as in the process of mountain building)	(geology) a rise of land to a higher elevation (as in the process of mountain building)