ascent vs heaving

ascent and heaving both are nouns.

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

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

Other hyponyms of ascent include levitation, heave, climb, mount, soar, zoom.

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

ascent (noun)	heaving (noun)
the act of changing location in an upward direction	throwing something heavy (with great effort)
a movement upward; rise above the ground	breathing heavily (as after exertion)
an upward slope or grade (as in a road)	the act of lifting something with great effort
	an upward movement (especially a rhythmical rising and falling)