come about vs spark

come about is not a noun while spark is a noun.

Word	Noun	Adjective	Verb	Adverb
come about	No	No	Yes	No
spark	Yes	No	Yes	No

come about (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

come about (verb)	spark (verb)
come to pass	put in motion or move to act
	emit or produce sparks