throb vs ache

throb and ache both are nouns.

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

As verbs, ache is a hypernym of throb; that is, ache is a word with a broader meaning than throb:

Other hypernyms of throb include hurt, smart.

throb (noun)	ache (noun)
an instance of rapid strong pulsation (of the heart)	a dull persistent (usually moderately intense) pain
a deep pulsating type of pain

throb (verb)	ache (verb)
tremble convulsively, as from fear or excitement	have a desire for something or someone who is not present
expand and contract rhythmically; beat rhythmically	be the source of pain
pulsate or pound with abnormal force	feel physical pain