Pain-killer and Shot

Shot and pain-killer are semantically related. in sleep-inducer topic. In some cases you can use "Shot" instead a noun phrase "Pain-killer", when it comes to topics like sleep-inducing or numbing drug.

Shot noun - A directed propelling of a missile by a firearm or artillery piece.

Pain-killer and shot are semantically related. You can use "Pain-killer" instead a noun "Shot".