"She shook/nodded her head no" [closed]

What part of speech of no is used here?

Adverb or particle, right?

It's not a well-expressed expression. You could put quote marks around the word "no" as it expresses the meaning of the gesture.

Compare 'To say, "no"' and 'To shake one's head, "no"'. They have the same structure.

The meaning of "no" is as a particle or interjection, not an adverb. It shows "disagreement, negation or prohibition."

When you shake your head, it has the same meaning as saying "no!"