pass out vs swoon

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

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

As verbs, pass out and swoon are synonyms defined as:

pass out and swoon: pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain

Other synonyms of pass out include conk, faint.

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

pass 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 pass out include conk, faint, pass out.

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

pass out (verb)	swoon (verb)
pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain	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
give to several people