pass off vs disregard

pass off is not a noun while disregard is a noun.

Word	Noun	Adjective	Verb	Adverb
pass off	No	No	Yes	No
disregard	Yes	No	Yes	No

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

Other hypernyms of pass off include brush aside, brush off, discount, dismiss, ignore, push aside.

pass off (noun)	disregard (noun)
	willful lack of care and attention
	lack of attention and due care

pass off (verb)	disregard (verb)
expel (gases or odors)	give little or no attention to
come to pass	bar from attention or consideration
disappear gradually	refuse to acknowledge
disregard
cause to be circulated and accepted in a false character or identity
be accepted as something or somebody in a false character or identity