rivet vs plunge

rivet and plunge both are nouns.

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

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

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

rivet (noun)	plunge (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	a brief swim in water
ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)	a steep and rapid fall

rivet (verb)	plunge (verb)
direct one's attention on something	begin with vigor
hold (someone's attention)	devote (oneself) fully to
fasten with a rivet or rivets	cause to be immersed
	immerse briefly into a liquid so as to wet, coat, or saturate
	thrust or throw into
	fall abruptly
	drop steeply
	dash violently or with great speed or impetuosity