flash vs cover

flash and cover both are nouns.

Word	Noun	Adjective	Verb	Adverb
flash	Yes	Yes	Yes	No
cover	Yes	No	Yes	No

As verbs, cover is a hypernym of flash; that is, cover is a word with a broader meaning than flash:

flash (noun)	cover (noun)
a lamp for providing momentary light to take a photograph	the act of concealing the existence of something by obstructing the view of it
a bright patch of color used for decoration or identification	fire that makes it difficult for the enemy to fire on your own individuals or formations
a momentary brightness	a false identity and background (especially one created for an undercover agent)
a sudden brilliant understanding	a recording of a song that was first recorded or made popular by somebody else
a short news announcement concerning some on-going news story	bedding that keeps a person warm in bed
a burst of light used to communicate or illuminate	a covering that serves to conceal or shelter something
a gaudy outward display	covering for a hole (especially a hole in the top of a container)
a sudden intense burst of radiant energy	the protective covering on the front, back, and spine of a book
a short vivid experience	a natural object that covers or envelops
a very short time (as the time it takes the eye to blink or the heart to beat)	a fixed charge by a restaurant or nightclub over and above the charge for food and drink

flash (adjective)	cover (adjective)
tastelessly showy

flash (verb)	cover (verb)
appear briefly	sit on (eggs)
emit a brief burst of light	clothe, as if for protection from the elements
make known or cause to appear with great speed	protect by insurance
protect by covering with a thin sheet of metal	act on verbally or in some form of artistic expression
run or move very quickly or hastily	be responsible for reporting the details of, as in journalism
gleam or glow intermittently	maintain a check on; especially by patrolling
display proudly; act ostentatiously or pretentiously	protect or defend (a position in a game)
expose or show briefly	hold within range of an aimed firearm
	play a higher card than the one previously played
	be responsible for guarding an opponent in a game
	provide with a covering or cause to be covered
	form a cover over
	copulate with a female, used especially of horses
	cover as if with a shroud
	put something on top of something else
	travel across or pass over
	hide from view or knowledge
	spread over a surface to conceal or protect
	be sufficient to meet, defray, or offset the charge or cost of
	to take an action to protect against future problems
	invest with a large or excessive amount of something
	help out by taking someone's place and temporarily assuming his responsibilities
	provide for
	span an interval of distance, space or time
	include in scope; include as part of something broader; have as one's sphere or territory
	make up for shortcomings or a feeling of inferiority by exaggerating good qualities