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Spy (Noun)

A secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night".

Nouns denoting people.

The agency employed a skilled spy to infiltrate the enemy's headquarters.
Her sister had a network of spies who kept her informed about her ex-boyfriend's activities.
According to my spies, you were spotted at the movie premiere last night.
The detective hired a spy to follow the suspect and gather evidence.
The company's competitors had a spy who stole their trade secrets and sold them to the highest bidder.

(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors.

Nouns denoting people.