This is the 173rd most frequent Spanish word.
uso
Use.
In this sentence, 'uso' functions as a noun referring to the act or manner of using something.
El uso del transporte público ayuda a reducir la contaminación.
The use of public transportation helps to reduce pollution.
Here, 'uso' is a verb, indicating the speaker's action of utilizing something.
Yo uso mi bicicleta para ir al trabajo.
I use my bicycle to go to work.
In this context, 'uso' again serves as a noun, emphasizing the proper way or method of using something.