兼任【けんにん】
serving concurrently as, holding the additional post of
兼ねる【かねる】
to be unable to, to find difficult (unpleasant, awkward, painful) to do, to serve two or more functions or roles simultaneously, to contain (or combine) two or more features, to work in two or more jobs simultaneously (positions, etc.), to do alongside, to hesitate to do something (out of consideration for others), to think of the future (as well as the present)
兼業【けんぎょう】
perusing as a side business, doing in addition to one's main work, running (businesses) simultaneously, side business, job on the side
気兼ね【きがね】
constraint, reserve, feeling hesitant, being afraid of troubling someone