periodic event vs pulse

periodic event and pulse both are nouns.

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

As nouns, pulse is a hyponym of periodic event; that is, pulse is a word with a more specific, narrower meaning than periodic event:

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

Other hyponyms of periodic event include migration, cycle, oscillation, repeat, repetition, sunrise, sunset, beat, heartbeat, pulsation, tide.

periodic event (noun)	pulse (noun)
an event that recurs at intervals	the rhythmic contraction and expansion of the arteries with each beat of the heart
	(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
	edible seeds of various pod-bearing plants (peas or beans or lentils etc.)
	the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health

periodic event (verb)	pulse (verb)
	produce or modulate (as electromagnetic waves) in the form of short bursts or pulses or cause an apparatus to produce pulses
	expand and contract rhythmically; beat rhythmically
	drive by or as if by pulsation