Synonyms for Spy

Synonyms starting with letter O

• observe

  secretly follow, catch sight of, notice
• operative

  investigate, person
• observer
• observe furtively
• outrider
• overhear
• onlooker
• ogle
• overlook
• opposition
• opponent
• other side
• outpost
• overhaul
• operatives
• on the QT
• obscured
• ogler