• 卒業そつぎょう — graduation
• 授業じゅぎょう — class / lesson
• 企業きぎょう — enterprise / company
• 産業さんぎょう — industry
• 従業員じゅうぎょういん — employee

業 originally depicted a tool rack, suggesting action or task. Over time, it came to mean one’s work or deeds. It also holds spiritual meaning in Buddhism as karma — the effects of one’s actions.