Is stick a adverb

NO!!!!

'stick' it is a verb or a noun depending on the context of the sentence.

NB To correct your English grammar, it is not ' Is stick a adverb'.

It should be written 'Is the Word 'stick', an adverb?'.

Note the insertion of more Words to convey the correct meaning, the use of punctuation marks (' , ? ) , The quotation marks to highlight the specific Word. The question mark (?), because you asking a question, and the indefinite article 'an' , because it preceeds a Word beginning with a vowel 'a'(adverb).

NB 99% of adverbs in the English language end in '---ly'. There are no adverbs in the question.