forehead vs os frontale

forehead and os frontale both are nouns.

Word	Noun	Adjective	Verb	Adverb
forehead	Yes	No	No	No
os frontale	Yes	No	No	No

As nouns, forehead and os frontale are synonyms defined as:

forehead and os frontale: the large cranial bone forming the front part of the cranium: includes the upper part of the orbits

Other synonyms of forehead include frontal bone.

forehead (noun)	os frontale (noun)
the part of the face above the eyes	the large cranial bone forming the front part of the cranium: includes the upper part of the orbits
the large cranial bone forming the front part of the cranium: includes the upper part of the orbits