jiffy vs heartbeat

jiffy and heartbeat both are nouns.

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

As nouns, jiffy and heartbeat are synonyms defined as:

jiffy and heartbeat: a very short time (as the time it takes the eye to blink or the heart to beat)

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

jiffy (noun)	heartbeat (noun)
a very short time (as the time it takes the eye to blink or the heart to beat)	an animating or vital unifying force
	the rhythmic contraction and expansion of the arteries with each beat of the heart
	a very short time (as the time it takes the eye to blink or the heart to beat)