What is another word for spy?

Need synonyms for spy? Here's a list of similar words from our thesaurus that you can use instead.

Noun
A person employed by a government or other organization to secretly obtain information on an enemy or competitor
“The locals feared he was a German spy and the government forced him to leave.”
Noun
One who relays confidential information to someone, especially to the police
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Noun
One who eavesdrops
Noun
A person who observes something attentively or regularly
Noun
One who enquires
Noun
A lookout (person who keeps watch)
Noun
Secret agent
Noun
An expedition to keep watch over an area, especially by guards or police walking or driving around at regular intervals
Verb
To discern, especially by careful observation
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“I strongly recommend you pick up the book next time you spy a copy on someone's bookshelf.”
Verb
To keep a secret watch on someone
“The chips transmit signals and civil liberties groups fear the technology could eventually be used to spy on consumers.”
Verb
To work as a spy
“I never agreed to spy for the United States.”
Verb
To search around, or look out, for something
“I walked down to the hillock by the roadside that particular Sunday after tea, to admire the view and to spy for possible deer.”
Verb
To hear a conversation one is not intended to hear
Verb
Look quickly or furtively
Verb
To delve or make inquiries into
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Verb
Investigate or look around furtively in an attempt to find out something, especially information about someone's private affairs
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Verb
Search unsystematically and untidily through something
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Adjective
Involving secret work within a community or organization, especially for the purposes of police investigation or espionage
momUS
mumUK
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