Here are some examples:
As a conjunction:
* He works as a doctor. (Indicates a function or role)
* As soon as he arrived, he started working. (Indicates time)
As a preposition:
* I know him as John. (Indicates a way of knowing someone)
* He is recognized as a great artist. (Indicates a way of being recognized)
There is no adjectival form of "as". However, you might be thinking of a different word or phrase. Please provide more context or the sentence you are trying to use it in, and I can help you further!