作 (saku) means “work” | MotiTan Japanese Dictionary

More examples

その作の結末には驚きました。so no saku no ketsu matsu ni wa odoro ki ma shi ta

I was surprised by the ending of that work.

It centers on a created result that can be recognized as an individual piece, whether artistic or made as part of a larger production.

作品sakuhin: A distinct creation treated as a complete work in art, writing, or another creative field.

創作・製作の結果として生み出された作品。sō saku sei saku no kek ka to shi te u mi da sa re ta saku hin

As a Sino-Japanese noun, 作 (saku, "work; production") derives its sense from 作 (saku, "to make; create"), naming something produced by that action.

In English, a single creation can be called a work even when it is not a job, which separates this sense from work meaning employment.