minute vs heartbeat

minute and heartbeat both are nouns.

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

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

minute: an indefinitely short time
heartbeat: a very short time (as the time it takes the eye to blink or the heart to beat)

Other hyponyms of minute include blink of an eye, flash, instant, jiffy, New York minute, split second, trice, twinkling, wink.

minute (noun)	heartbeat (noun)
distance measured by the time taken to cover it	an animating or vital unifying force
a short note	the rhythmic contraction and expansion of the arteries with each beat of the heart
a unit of angular distance equal to a 60th of a degree	a very short time (as the time it takes the eye to blink or the heart to beat)
a unit of time equal to 60 seconds or 1/60th of an hour
an indefinitely short time
a particular point in time

minute (adjective)	heartbeat (adjective)
characterized by painstaking care and detailed examination
infinitely or immeasurably small