frontal eminence vs protrusion

frontal eminence and protrusion both are nouns.

Word	Noun	Adjective	Verb	Adverb
frontal eminence	Yes	No	No	No
protrusion	Yes	No	No	No

As nouns, protrusion is a hypernym of frontal eminence; that is, protrusion is a word with a broader meaning than frontal eminence:

frontal eminence: either prominence of the frontal bone above each orbit
protrusion: something that bulges out or is protuberant or projects from its surroundings

Other hypernyms of frontal eminence include bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protuberance, swelling.

frontal eminence (noun)	protrusion (noun)
either prominence of the frontal bone above each orbit	the act of projecting out from something
	something that bulges out or is protuberant or projects from its surroundings