This is the 6901st most frequent Catalan word.
uso
The word "uso" is not Catalan; it is Spanish and means "use" in English.
In this sentence, 'ús' is used as a noun to refer to the act of using something.
El meu ús de l'ordinador ha millorat amb la pràctica.
My use of the computer has improved with practice.
Here, 'uso' is a verb in the first-person singular present tense form, meaning 'I use.'
Sempre uso una agenda per organitzar el meu dia.
I always use a planner to organize my day.
In this instance, 'ús' again appears as a noun emphasizing the act or manner of using something, here the proper use of resources.