This is the 1526th most frequent Catalan word.
bus
Bus: bus.
Here, 'bus' is used to denote a means of transportation.
Vaig agafar el bus per anar a la ciutat.
I took the bus to go to the city.
In this sentence, 'bus' is used to identify the particular vehicle being discussed.
El conductor del bus va ser molt amable.
The bus driver was very kind.
This usage of 'bus' is to indicate the specific public transport vehicle the speaker is waiting for.