heartbeat vs beat

heartbeat and beat both are nouns.

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

As nouns, heartbeat and beat are synonyms defined as:

heartbeat and beat: the rhythmic contraction and expansion of the arteries with each beat of the heart

Other synonyms of heartbeat include pulsation, pulse.

heartbeat (noun)	beat (noun)
an animating or vital unifying force	the act of beating to windward; sailing as close as possible to the direction from which the wind is blowing
the rhythmic contraction and expansion of the arteries with each beat of the heart	a stroke or blow
a very short time (as the time it takes the eye to blink or the heart to beat)	a regular rate of repetition
	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

heartbeat (adjective)	beat (adjective)
	very tired

heartbeat (verb)	beat (verb)
	wear out completely
	be a mystery or bewildering to
	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