Most common:
* Pharmacy: This is the most common and widely understood term.
* Drugstore: This is still used in some regions, particularly the US.
Less common, but still used:
* Chemist's: Used in the UK, Australia, and some other Commonwealth countries.
* Apothecary: This is a more old-fashioned term, but it can still be used for traditional pharmacies.
Informal:
* Chemists: This is a shortened version of "chemist's" and is used informally in some regions.
The best word to use depends on the context and the specific region.