lobby
US /ˈlɑː.bi/
UK /ˈlɑː.bi/

1.
a group of people who try to influence legislation on behalf of a special interest
:
•
The gun lobby is very powerful in this country.
•
They formed a lobby to advocate for environmental protection.
2.
a hall or waiting room at the entrance to a building
:
•
Please wait for me in the hotel lobby.
•
The building has a spacious and elegant lobby.