WordNet sense 1 (a commercial or industrial enterprise and the people who constitute it):

business, business concern, business organisation, business organization

WordNet sense 2 (an anxious feeling):

care, fear

WordNet sense 3 (something or someone that causes anxiety; a source of unhappiness):

headache, vexation, worry

WordNet sense 4 (be on the mind of):

interest, occupy

WordNet sense 5 (have to do with or be relevant to):

pertain, refer, relate, touch, come to, touch on, bear on