frontal eminence vs gibbosity

frontal eminence and gibbosity both are nouns.

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

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

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

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

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