concern vs center on

concern is a noun but center on is not a noun.

Word	Noun	Adjective	Verb	Adverb
concern	Yes	No	Yes	No
center on	No	No	Yes	No

As verbs, center on is a hyponym of concern; that is, center on is a word with a more specific, narrower meaning than concern:

concern (noun)	center on (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

concern (verb)	center on (verb)
be relevant to	center upon
be on the mind of	have as a center