Let's break it down:
* As is a conjunction or preposition. In this case, it's acting as a conjunction, connecting the phrase to a preceding adjective or adverb.
* Possible is an adjective.
* Together, "as possible" modifies the preceding word or phrase, indicating the degree or extent to which something is possible.
Example:
* "I'll do it as quickly as possible." (Here, "as quickly as possible" modifies the verb "do", indicating the degree of speed.)
Therefore, while "possible" is an adjective, "as possible" functions as an adverbial phrase modifying a preceding adjective or adverb.