profession

noun [集合/集体]（尤指需要长期训练和正规资格的）职业；（某）职业界同行，同业；（统称，指需要较高教育水平的）职业（the professions）；（信念、观点或感情的）公开表示，表白；入教誓言，修道誓约；入教仪式，入教

You can use profession to refer to all the people who have the same profession. ^{同业的全体人员The attitude of the medical profession is very much more liberal now. 医学人士的态度如今开放多了。}