A noun, but CAN be used as a verb, as in looking at something in secret. He is a spy for the other side. I am going to see if I can spy where they are putting the treasure.
Spied is a verb (past tense of spy).
It is a noun or a verb. noun: James Bond was a spy in MI5. verb: The Russians were spying on the Germans.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "lecturer" is a noun.