throb vs pulsate

throb is a noun but pulsate is not a noun.

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

As verbs, throb and pulsate are synonyms defined as:

Other synonyms of throb include pulse.

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

throb (verb)	pulsate (verb)
tremble convulsively, as from fear or excitement	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	expand and contract rhythmically; beat rhythmically
pulsate or pound with abnormal force	move with or as if with a regular alternating motion