Shot
Injection
noun, verbal noun
When you shoot something into someone that you actually have to pour (aka a liquid), you're shooting them up with a needle, giving them a shot / injection.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
腰が痛かったんですが、お医者さんが痛み止めの注射を打ってくれました。
My lower back was sore so the doctor gave me a shot of painkillers.