zonk out vs swoon

zonk out is not a noun while swoon is a noun.

Word	Noun	Adjective	Verb	Adverb
zonk out	No	No	Yes	No
swoon	Yes	No	Yes	No

As verbs, swoon is a hyponym of zonk out; that is, swoon is a word with a more specific, narrower meaning than zonk out:

zonk out: lose consciousness due to a sudden trauma, for example
swoon: pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain

Other hyponyms of zonk out include conk, faint, pass out.

zonk out (noun)	swoon (noun)
	a spontaneous loss of consciousness caused by insufficient blood to the brain

zonk out (verb)	swoon (verb)
fall asleep fast, as when one is extremely tired	pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain
lose consciousness due to a sudden trauma, for example