rivet vs absorb

rivet is a noun but absorb is not a noun.

Word	Noun	Adjective	Verb	Adverb
rivet	Yes	No	Yes	No
absorb	No	No	Yes	No

As verbs, absorb is a hyponym of rivet; that is, absorb is a word with a more specific, narrower meaning than rivet:

Other hyponyms of rivet include engross, engulf, immerse, plunge, soak up, steep, recall, think, zoom in, hear, listen, take heed.

As verbs, absorb is a hypernym of rivet; that is, absorb is a word with a broader meaning than rivet:

Other hypernyms of rivet include engage, engross, occupy.

rivet (noun)	absorb (noun)
heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together
ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)

rivet (verb)	absorb (verb)
direct one's attention on something	cause to become one with
hold (someone's attention)	take up mentally
fasten with a rivet or rivets	consume all of one's attention or time
	devote (oneself) fully to
	take in, also metaphorically
	become imbued
	assimilate or take in
	take up, as of debts or payments
	suck or take up or in