light speed vs constant

constant vs light speed

light speed and constant both are nouns.

light speed is not an adjective while constant is an adjective.

Word	Noun	Adjective	Verb	Adverb
light speed	Yes	No	No	No
constant	Yes	Yes	No	No

As nouns, constant is a hypernym of light speed; that is, constant is a word with a broader meaning than light speed:

light speed: the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
constant: a number representing a quantity assumed to have a fixed value in a specified mathematical context

Other hypernyms of light speed include speed, velocity.

light speed (noun)	constant (noun)
the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second	a quantity that does not vary
	a number representing a quantity assumed to have a fixed value in a specified mathematical context

light speed (adjective)	constant (adjective)
	steadfast in purpose or devotion or affection
	uninterrupted in time and indefinitely long continuing
	unvarying in nature

Difference between light speed and constant

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