office [ˈɒfɪs] 办公室;办公楼
officer [ˈɒfɪsə(r)] 军官;官员，高级职员;警察的头衔
He's waiting for you at his office.
This is our new office, I will show you around.
The police officer took my name and address.
He wants to be a police officer when he grows up.