| spy | (noun) (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors | Synonyms: undercover agent |
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| (noun) a secret watcher; someone who secretly watches other people | - |
| (verb) secretly collect sensitive or classified information; engage in espionage | - |
| (verb) watch, observe, or inquire secretly | Synonyms: sleuth, snoop, stag |
| (verb) catch sight of | Synonyms: descry, espy, spot |
| (verb) catch sight of; to perceive with the eyes | Synonyms: sight |
| spyglass | (noun) a small refracting telescope | Synonyms: field glass, glass |
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| spyhole | (noun) a hole (in a door or an oven etc) through which you can peep | Synonyms: eyehole, peephole |
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| spying | (noun) the act of keeping a secret watch for intelligence purposes | Synonyms: undercover work |
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| (noun) keeping a secret or furtive watch | - |
| (noun) the act of detecting something; catching sight of something | Synonyms: catching, detection, espial, spotting |
| spymaster | (noun) someone who directs clandestine intelligence activities | - |
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| spyware | (noun) computer software that obtains information from a user's computer without the user's knowledge or consent | - |
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