A rifle action.
Gawkers always try to get as close to the action as possible.
Word: "action"
different meanings

Mark homework.
This sign marks the border.
Word: "mark"
different meanings

Did you catch a cold?
I caught some Z's on the train.
Word: "catch"
different meanings

He occupied a post in the treasury.
Parcel post.
Word: "post"
the same meaning