This is the 2601st most frequent Russian word.
такси
Taxi.
In this sentence, 'такси' refers to a mode of transportation (taxi) as the object of the action.
Я вызвал такси, чтобы доехать до аэропорта.
I called a taxi to get to the airport.
Here, 'такси' is in the plural context of available taxis in general as the target of the action.
Мы стояли на улице и ловили такси.
We stood on the street and were hailing a taxi.
In this example, 'такси' is a singular noun referring to the specific vehicle that arrived.