faint vs pass out

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

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

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

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

Other synonyms of faint include conk, swoon.

As verbs, pass out is a hypernym of faint; that is, pass out is a word with a broader meaning than faint:

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

Other hypernyms of faint include black out, zonk out.

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

faint (adjective)	pass out (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

faint (verb)	pass out (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