pass off vs spark

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

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

pass off (noun)	spark (noun)
	merriment expressed by a brightness or gleam or animation of countenance
	a momentary flash of light
	a small fragment of a burning substance thrown out by burning material or by friction
	electrical conduction through a gas in an applied electric field
	a small but noticeable trace of some quality that might become stronger

pass off (verb)	spark (verb)
expel (gases or odors)	put in motion or move to act
come to pass	emit or produce sparks
disappear gradually
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