pulse vs throb

pulse and throb both are nouns.

Word	Noun	Adjective	Verb	Adverb
pulse	Yes	No	Yes	No
throb	Yes	No	Yes	No

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

pulse: the rhythmic contraction and expansion of the arteries with each beat of the heart
throb: an instance of rapid strong pulsation (of the heart)

Other hyponyms of pulse include diastole, systole, pounding, throbbing.

As verbs, pulse and throb are synonyms defined as:

Other synonyms of pulse include pulsate.

pulse (noun)	throb (noun)
the rhythmic contraction and expansion of the arteries with each beat of the heart	an instance of rapid strong pulsation (of the heart)
(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)	a deep pulsating type of pain
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

pulse (verb)	throb (verb)
produce or modulate (as electromagnetic waves) in the form of short bursts or pulses or cause an apparatus to produce pulses	tremble convulsively, as from fear or excitement
expand and contract rhythmically; beat rhythmically	expand and contract rhythmically; beat rhythmically
drive by or as if by pulsation	pulsate or pound with abnormal force