frontal eminence vs gibbousness

frontal eminence and gibbousness both are nouns.

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

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

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

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

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