Is as a conjunction

Answer 1

Yes, it can be a subordinating conjunction when it means "because." It can connect clauses of cause.

The word as can also be a preposition, adverb (e.g. as sweetly), or pronoun.

Answer 2

Yes, "as" can function as a conjunction when it is used to introduce a clause that expresses reason or comparison. For example, "She sang as if she were a professional" uses "as" as a conjunction to indicate the way in which she sang.