Synonyms for as

While

in the process of, in the act of, on the point of; see while 1.

Because

since, inasmuch as, for the reason that; see because.

To the same degree

in the same way, in the same manner, equally, comparatively, similarly.

For a given purpose, end, use, etc

just as, qua (Latin), just for, serving as, functioning as, acting as, in the capacity of, being, in and of itself, by its nature, essentially.