upthrust vs upthrow

upthrust and upthrow both are nouns.

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

As nouns, upthrust and upthrow are synonyms defined as:

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

Other synonyms of upthrust include upheaval, uplift.

upthrust (noun)	upthrow (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)