pulsate vs throb

pulsate is not a noun while throb is a noun.

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

As verbs, pulsate and throb are synonyms defined as:

Other synonyms of pulsate include pulse.

pulsate (noun)	throb (noun)
	an instance of rapid strong pulsation (of the heart)
	a deep pulsating type of pain

pulsate (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
move with or as if with a regular alternating motion	pulsate or pound with abnormal force