Yes, it can. In is an adverb in the sentence "I will go in" although where the person goes "in" (into) is not defined. With an object noun, in is a preposition, and a phrase could be an adverb or an adjective phrase. E.g. I went in the park. The fountain in the park is broken.
No. The proper adjective Roman is not used as an adverb. There is a VERY rarely-used adverb, Romanly.
Has is a form of the verb "to have" and is not used as an adverb.
The word "as" can be used as an adverb.
An adverb is used to describe verbs, adjectives, or other adverbs.
No. The adverb would be "scarily."
Yes it can be used as an adverb.
Adverb
No, it is not an adverb. Flouncy is an adjective. There is a seldom-used adverb form "flouncily."
Adverbs are used to describe or modify a verb, an adjective, or another adverb.
No, the word "from" is a preposition. It cannot be used as an adverb.
No, it is an adjective. The adverb (seldom used) is foamily.
One adverb (rarely used) is agreeingly.An adverb more frequently used is agreeably, from the related adjective agreeable.