Is sticks a noun or a pronoun?

The Word 'sticks' is both a noun and a verb (not a pronoun).

The noun 'sticks' is the plural form of the singular noun 'stick', a Word for a thin piece of wood that has fallen or been cut from a tree; a thin piece of wood that has been trimmed for a particular purpose; a Word for a thing.

The verb 'sticks' is the third person, singular present of the verb to 'stick', meaning to adhere or to cling to a surface; to push a sharp or pointed object into or through something.

A pronoun is a Word that takes the place of a noun in a sentence. For example:

His walking stick was polished wood and brass. It gave him an air of elegance.

The pronoun 'it' takes the place of the noun 'stick' in the second sentence.