throb vs twang

throb and twang both are nouns.

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

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

throb (noun)	twang (noun)
an instance of rapid strong pulsation (of the heart)	exaggerated nasality in speech (as in some regional dialects)
a deep pulsating type of pain	a sharp vibrating sound (as of a plucked string)

throb (verb)	twang (verb)
tremble convulsively, as from fear or excitement	pronounce with a nasal twang
expand and contract rhythmically; beat rhythmically	pluck (strings of an instrument)
pulsate or pound with abnormal force	sound with a twang
	cause to sound with a twang
	twitch or throb with pain