Is plucked a noun

No, the Word 'plucked' is the past participle, past tense of the verb to pluck. The past participle of the verb also functions as an adjective.

The Word 'pluck' is a verb and a noun.

The noun 'pluck' is a Word for the quality of being brave and determined; courage; spirit.

The noun forms of the verb to pluck are plucker (one who plucks) and the gerund, plucking.