rivet vs fasten

rivet is a noun but fasten is not a noun.

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

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

Other hypernyms of rivet include fix, secure.

rivet (noun)	fasten (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)	fasten (verb)
direct one's attention on something	make tight or tighter
hold (someone's attention)	become fixed or fastened
fasten with a rivet or rivets	cause to be firmly attached
	attach to