No. It may be a pronoun, adjective, or conjunction.
both is so an adverb!
Isn't is a contraction of both a verb and an adverb. Is (verb) not (adverb).
both
the word" comfortable " can be used both ways as an adverb or adjective.
The adverb in your sentence is 'thereafter'.
Not both together. Go is a verb, and back is the adverb.
Yes the word "early" can be both an adjective and an adverb.
Both!
Both!
It can be both.
both
both