pulsation vs periodic event

pulsation and periodic event both are nouns.

Word	Noun	Adjective	Verb	Adverb
pulsation	Yes	No	No	No
periodic event	Yes	No	No	No

As nouns, periodic event is a hypernym of pulsation; that is, periodic event is a word with a broader meaning than pulsation:

pulsation: the rhythmic contraction and expansion of the arteries with each beat of the heart
periodic event: an event that recurs at intervals

Other hypernyms of pulsation include recurrent event.

pulsation (noun)	periodic event (noun)
(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)	an event that recurs at intervals
the rhythmic contraction and expansion of the arteries with each beat of the heart
a periodically recurring phenomenon that alternately increases and decreases some quantity