thump vs throb

thump and throb both are nouns.

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

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

Other hyponyms of thump include pulsate, pulse, flutter, palpitate, thrash, flap.

thump (noun)	throb (noun)
a heavy blow with the hand	an instance of rapid strong pulsation (of the heart)
a heavy dull sound (as made by impact of heavy objects)	a deep pulsating type of pain

thump (verb)	throb (verb)
hit hard with the hand, fist, or some heavy instrument	tremble convulsively, as from fear or excitement
move rhythmically	expand and contract rhythmically; beat rhythmically
make a dull sound	pulsate or pound with abnormal force