rate vs beat

rate and beat both are nouns.

Word	Noun	Adjective	Verb	Adverb
rate	Yes	No	Yes	No
beat	Yes	Yes	Yes	No

As nouns, beat is a hyponym of rate; that is, beat is a word with a more specific, narrower meaning than rate:

rate (noun)	beat (noun)
the relative speed of progress or change	the act of beating to windward; sailing as close as possible to the direction from which the wind is blowing
amount of a charge or payment relative to some basis	a stroke or blow
a quantity or amount or measure considered as a proportion of another quantity or amount or measure	a regular rate of repetition
a magnitude or frequency relative to a time unit	the basic rhythmic unit in a piece of music
	(prosody) the accent in a metrical foot of verse
	the rhythmic contraction and expansion of the arteries with each beat of the heart
	the sound of stroke or blow
	a regular route for a sentry or policeman
	a member of the beat generation; a nonconformist in dress and behavior
	a single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations

rate (adjective)	beat (adjective)
	very tired

rate (verb)	beat (verb)
assign a rank or rating to	wear out completely
estimate the value of	be a mystery or bewildering to
be worthy of or have a certain rating	come out better in a competition, race, or conflict
	beat through cleverness and wit
	hit repeatedly
	give a beating to; subject to a beating, either as a punishment or as an act of aggression
	stir vigorously
	strike (a part of one's own body) repeatedly, as in great emotion or in accompaniment to music
	strike (water or bushes) repeatedly to rouse animals for hunting
	shape by beating
	make by pounding or trampling
	produce a rhythm by striking repeatedly
	move rhythmically
	sail with much tacking or with difficulty
	move with a flapping motion
	indicate by beating, as with the fingers or drumsticks
	move with a thrashing motion
	move with or as if with a regular alternating motion
	make a rhythmic sound
	make a sound like a clock or a timer
	glare or strike with great intensity
	avoid paying
	be superior