asphyxiate vs close up

asphyxiate and close up both are verbs.

Word	Noun	Adjective	Verb	Adverb
asphyxiate	No	No	Yes	No
close up	No	No	Yes	Yes

As verbs, close up is a hypernym of asphyxiate; that is, close up is a word with a broader meaning than asphyxiate:

Other hypernyms of asphyxiate include block, impede, jam, obstruct, obturate, occlude.

asphyxiate (verb)	close up (verb)
be asphyxiated; die from lack of oxygen	refuse to talk or stop talking; fall silent
deprive of oxygen and prevent from breathing	block passage through
impair the respiration of or obstruct the air passage of	unite or bring into contact or bring together the edges of
	cease to operate or cause to cease operating

asphyxiate (adverb)	close up (adverb)
	very close