occipital protuberance vs bump

occipital protuberance and bump both are nouns.

Word	Noun	Adjective	Verb	Adverb
occipital protuberance	Yes	No	No	No
bump	Yes	No	Yes	No

As nouns, bump is a hypernym of occipital protuberance; that is, bump is a word with a broader meaning than occipital protuberance:

occipital protuberance: prominence on the outer surface of the occipital bone
bump: something that bulges out or is protuberant or projects from its surroundings

Other hypernyms of occipital protuberance include bulge, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, protuberance, swelling.

occipital protuberance (noun)	bump (noun)
prominence on the outer surface of the occipital bone	an impact (as from a collision)
	something that bulges out or is protuberant or projects from its surroundings
	a lump on the body caused by a blow

occipital protuberance (verb)	bump (verb)
	knock against with force or violence
	remove or force from a position of dwelling previously occupied
	to play music at loud volume
	to enjoy some music greatly
	dance erotically or dance with the pelvis thrust forward
	come upon, as if by accident; meet with
	assign to a lower position; reduce in rank