Is goes an adverb

No, goes is a verb.

Goes is the third person singular form of go. Use goes when the subject of the sentence is he/she/it or a singular noun. eg:

He goes to work everyday.

It goes stale very quickly.

The doctor goes to the clinic everyday. - singular noun subject = the doctor

Compare this with plural subjects eg:

We go to work every day.

The boys go to school.