ascent vs upheaval

ascent and upheaval both are nouns.

Word	Noun	Adjective	Verb	Adverb
ascent	Yes	No	No	No
upheaval	Yes	No	No	No

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

ascent: a movement upward; rise above the ground
upheaval: (geology) a rise of land to a higher elevation (as in the process of mountain building)

ascent (noun)	upheaval (noun)
the act of changing location in an upward direction	disturbance usually in protest
a movement upward; rise above the ground	(geology) a rise of land to a higher elevation (as in the process of mountain building)
an upward slope or grade (as in a road)	a state of violent disturbance and disorder (as in politics or social conditions generally)
	a violent disturbance