pontifical vs vestment

pontifical and vestment both are nouns.

Word	Noun	Adjective	Verb	Adverb
pontifical	Yes	Yes	No	No
vestment	Yes	No	No	No

As nouns, vestment is a hypernym of pontifical; that is, vestment is a word with a broader meaning than pontifical:

pontifical: the vestments and other insignia of a pontiff (especially a bishop)
vestment: gown (especially ceremonial garments) worn by the clergy

pontifical (noun)	vestment (noun)
the vestments and other insignia of a pontiff (especially a bishop)	gown (especially ceremonial garments) worn by the clergy

pontifical (adjective)	vestment (adjective)
denoting or governed by or relating to a bishop or bishops
proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles
puffed up with vanity