revolve about vs concern

revolve about is not a noun while concern is a noun.

Word	Noun	Adjective	Verb	Adverb
revolve about	No	No	Yes	No
concern	Yes	No	Yes	No

As verbs, concern is a hypernym of revolve about; that is, concern is a word with a broader meaning than revolve about:

Other hypernyms of revolve about include bear on, come to, have to do with, pertain, refer, relate, touch, touch on.

revolve about (noun)	concern (noun)
	something that interests you because it is important or affects you
	something or someone that causes anxiety; a source of unhappiness
	a feeling of sympathy for someone or something
	an anxious feeling
	a commercial or industrial enterprise and the people who constitute it

revolve about (verb)	concern (verb)
center upon	be relevant to
	be on the mind of