frontispiece vs frontal

frontispiece and frontal both are nouns.

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

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

Other hypernyms of frontispiece include facade, frontage.

frontispiece (noun)	frontal (noun)
front illustration facing the title page of a book	an adornment worn on the forehead
an ornamental facade	a drapery that covers the front of an altar
	the face or front of a building

frontispiece (adjective)	frontal (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