This is the 4207th most frequent Catalan word.
espia
Spy.
In this sentence, 'espia' is used as a noun referring to a person who secretly gathers information.
L'espia va ser descobert per la policia.
The spy was discovered by the police.
Here, 'espia' is used as a verb meaning to secretly watch or observe someone.
Ell espia els seus veïns a través de la finestra.
He spies on his neighbors through the window.
In this context, 'espia' again refers to a profession as a noun.