Nouns

(n)concernsomething that interests you because it is important or affects you“the safety of the ship is the captain's concern”
(n)concern, care, fearan anxious feeling“care had aged him”, “they hushed it up out of fear of public reaction”
(n)concerna feeling of sympathy for someone or something“She felt strong concern for those less fortunate”
(n)concern, worry, headache, vexationsomething or someone that causes anxiety; a source of unhappiness“New York traffic is a constant concern”, “it's a major worry”
(n)business, concern, business concern, business organization, business organisationa commercial or industrial enterprise and the people who constitute it“he bought his brother's business”, “a small mom-and-pop business”, “a racially integrated business concern”

Verbs

(v)refer, pertain, relate, concern, come to, bear on, touch, touch on, have to do withbe relevant to“There were lots of questions referring to her talk”, “My remark pertained to your earlier comments”
(v)concern, interest, occupy, worrybe on the mind of“I worry about the second Germanic consonant shift”