How do you say spy in Chinese?
— 間諜, 间谍 (jiàndié)

Specialized synonyms for spy in Chinese
find找到 (zhǎodào)
mole鼴, 鼹 (yǎn), 鼴鼠, 鼹鼠 (yǎnshǔ)
shadow陰影
tail尾巴 (wěibā)