frontal vs curtain

frontal and curtain both are nouns.

Word	Noun	Adjective	Verb	Adverb
frontal	Yes	Yes	No	No
curtain	Yes	No	Yes	No

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

Other hypernyms of frontal include drape, drapery, mantle, pall.

frontal (noun)	curtain (noun)
an adornment worn on the forehead	hanging cloth used as a blind (especially for a window)
a drapery that covers the front of an altar	any barrier to communication or vision
the face or front of a building

frontal (adjective)	curtain (adjective)
of or relating to the front of an advancing mass of air
meeting front to front
belonging to the front part
of or adjacent to the forehead or frontal bone

frontal (verb)	curtain (verb)
	provide with drapery