pompous vs portentous

pompous and portentous both are adjectives.

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

As adjectives, pompous and portentous are synonyms defined as:

Other synonyms of pompous include grandiloquent, overblown, pontifical.

pompous (adjective)	portentous (adjective)
characterized by pomp and ceremony and stately display	puffed up with vanity
puffed up with vanity	ominously prophetic
	of momentous or ominous significance