雇傭[koyou] employment (long term)
傭い兵[yatoihei] mercenary soldier
傭人[younin] employee
傭船[yousen] chartered ship
傭船契約[yousenkeiyaku] chartering ships

傭兵[youhei] mercenary (soldier)
傭聘[youhei] employing
傭う[yatou] to employ
日傭取[hiyoutori] day laborer
被傭者[hiyousha] employee

使聘[shihei] exchange of diplomatic representatives
招聘[shouhei] (courteous) invitation

傭聘[youhei] employing
招聘理由書[shouheiriyuusho] invitation letter (e.g. document in support of a visa to enter Japan)