cover vs flash

cover and flash both are nouns.

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

As verbs, flash is a hyponym of cover; that is, flash is a word with a more specific, narrower meaning than cover:

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

cover (adjective)	flash (adjective)
	tastelessly showy

cover (verb)	flash (verb)
sit on (eggs)	appear briefly
clothe, as if for protection from the elements	emit a brief burst of light
protect by insurance	make known or cause to appear with great speed
act on verbally or in some form of artistic expression	protect by covering with a thin sheet of metal
be responsible for reporting the details of, as in journalism	run or move very quickly or hastily
maintain a check on; especially by patrolling	gleam or glow intermittently
protect or defend (a position in a game)	display proudly; act ostentatiously or pretentiously
hold within range of an aimed firearm	expose or show briefly
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