forehead vs lineament

forehead and lineament both are nouns.

Word	Noun	Adjective	Verb	Adverb
forehead	Yes	No	No	No
lineament	Yes	No	No	No

As nouns, lineament is a hypernym of forehead; that is, lineament is a word with a broader meaning than forehead:

forehead: the part of the face above the eyes
lineament: the characteristic parts of a person's face: eyes and nose and mouth and chin

Other hypernyms of forehead include feature.

forehead (noun)	lineament (noun)
the part of the face above the eyes	the characteristic parts of a person's face: eyes and nose and mouth and chin
the large cranial bone forming the front part of the cranium: includes the upper part of the orbits	a characteristic property that defines the apparent individual nature of something