The ex-alcoholic became a counselor at a sobriety support group after recovery.

ex-alcoholic 是由前缀 ex-（表示"前、前任"）和名词 alcoholic（酗酒者）组成的复合词。ex- 表示"从前的、不再是的"，alcoholic 指"酗酒者"。 ex-alcoholic 指"曾经酗酒但现在已经戒酒的人"。