This is the 19471st most frequent Korean word.
약국
Pharmacy.
Here, "약국" (pharmacy) refers to the location where medicines are sold, directly indicating the place where the action took place.
저는 약국에서 감기약을 샀어요.
I bought cold medicine at the pharmacy.
In this case, "약국" is used to inquire about the location of any pharmacy nearby.
이 근처에 약국이 어디 있는지 아세요?
Do you know where the pharmacy is around here?
"약국" here indicates the premise where medical services, aside from medicine, can be accessed.