Suddenly.
The adverb is the word "earlier."
no"Snow" can either be a noun (eg: "There's snow on the ground") or a verb (eg: It will snow tomorrow), but not an adverb.
Snow flurries fell as the temperature started dropping.
As soon as the girl fell in the snow she immediately stood up and started to shiver for the freezing snow was too cold for her to handle.
moves
As an an adjective: Your new car looks a bit sporty for you.As an adverb: We just sat and watched the new fallen snow.
Snow in this sentence is the verb.
Snow is white.
"snow" is a verb.
(The) snow
Snow is a noun in that example.
It can be, when it is used idiomatically, e.g turned down cold, cold sober. Otherwise it is an adjective and the adverb form is coldly.