This is the 937th most frequent Ukrainian word.
метро
Subway.
In this sentence, 'метро' refers to the urban rapid transit system used as a means of transportation.
Я щодня їжджу на роботу в метро.
I commute to work daily by metro.
Here, 'метро' indicates the facility or station where the rapid transit system operates.
У метро було досить людно під час години пік.
The metro was quite crowded during rush hour.
In this context, 'метро' denotes the specific metro system in Kyiv as an infrastructure or organization.