pompous vs pontifical

pompous is not a noun while pontifical is a noun.

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

As adjectives, pompous and pontifical are synonyms defined as:

Other synonyms of pompous include grandiloquent, overblown, portentous.

pompous (noun)	pontifical (noun)
	the vestments and other insignia of a pontiff (especially a bishop)

pompous (adjective)	pontifical (adjective)
characterized by pomp and ceremony and stately display	denoting or governed by or relating to a bishop or bishops
puffed up with vanity	proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles
	puffed up with vanity