company: a commercial business 侧重于商业
enterprise:a business firm 侧重于公司
institution: a society or organization founded esp. for charitable, religious, educational, or social purposes.主要指以慈善,宗教,教育及社会为目的的
organization: an organized body, esp. a business, government department, charity, ect.侧重于组织,主要用于企业,政府部门,慈善团体等。
参考资料:英文释义出自牛津双解