Man-made fiber and Synthetic fibers

Man-made fiber noun - Fiber created from natural materials or by chemical processes.

Synthetic fibers and man-made fiber are semantically related. In some cases you can replace phrase "Synthetic fibers" with "Man-made fiber", this phrases are similar.

Man-made fiber and synthetic fibers are semantically related. You can use "Man-made fiber" instead a noun phrase "Synthetic fibers".