pass out vs faint

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

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

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

pass out and faint: 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, swoon.

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

pass out: lose consciousness due to a sudden trauma, for example
faint: 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, pass out, swoon.

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

pass out (adjective)	faint (adjective)
	lacking conviction or boldness or courage
	weak and likely to lose consciousness
	lacking clarity or distinctness
	deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc
	lacking strength or vigor
	indistinctly understood or felt or perceived

pass out (verb)	faint (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