scale vs cover

scale and cover both are nouns.

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

As nouns, cover is a hypernym of scale; that is, cover is a word with a broader meaning than scale:

scale: a flattened rigid plate forming part of the body covering of many animals
cover: a natural object that covers or envelops

Other hypernyms of scale include covering, natural covering.

scale (noun)	cover (noun)
a flattened rigid plate forming part of the body covering of many animals	the act of concealing the existence of something by obstructing the view of it
an indicator having a graduated sequence of marks	fire that makes it difficult for the enemy to fire on your own individuals or formations
a measuring instrument for weighing; shows amount of mass	a false identity and background (especially one created for an undercover agent)
a metal sheathing of uniform thickness (such as the shield attached to an artillery piece to protect the gunners)	a recording of a song that was first recorded or made popular by somebody else
(music) a series of notes differing in pitch according to a specific scheme (usually within an octave)	bedding that keeps a person warm in bed
a thin flake of dead epidermis shed from the surface of the skin	a covering that serves to conceal or shelter something
a specialized leaf or bract that protects a bud or catkin	covering for a hole (especially a hole in the top of a container)
relative magnitude	the protective covering on the front, back, and spine of a book
the ratio between the size of something and a representation of it	a natural object that covers or envelops
an ordered reference standard	a fixed charge by a restaurant or nightclub over and above the charge for food and drink

scale (verb)	cover (verb)
measure with or as if with scales	sit on (eggs)
size or measure according to a scale	clothe, as if for protection from the elements
remove the scales from	protect by insurance
pattern, make, regulate, set, measure, or estimate according to some rate or standard	act on verbally or in some form of artistic expression
climb up by means of a ladder	be responsible for reporting the details of, as in journalism
reach the highest point of	maintain a check on; especially by patrolling
take by attacking with scaling ladders	protect or defend (a position in a game)
measure by or as if by a scale	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