No. The proper adjective Roman is not used as an adverb. There is a VERY rarely-used adverb, Romanly.
The word "as" can be used as an adverb.
Has is a form of the verb "to have" and is not used as an adverb.
An adverb is used to describe verbs, adjectives, or other adverbs.
It used to be both. Nowadays it is used mostly as an adverb.
Yes it can be used as an adverb.
No. The adverb would be "scarily."
No, it is not an adverb. Flouncy is an adjective. There is a seldom-used adverb form "flouncily."
Really is an adverb. Very can be used as an adverb and an adjective.
Adverbs are used to describe or modify a verb, an adjective, or another adverb.
No, it is an adjective. The adverb (seldom used) is foamily.