synthetic fiber vs man-made fiber

synthetic fiber and man-made fiber both are nouns.

Word	Noun	Adjective	Verb	Adverb
synthetic fiber	Yes	No	No	No
man-made fiber	Yes	No	No	No

As nouns, synthetic fiber and man-made fiber are synonyms defined as:

synthetic fiber and man-made fiber: fiber created from natural materials or by chemical processes

synthetic fiber (noun)	man-made fiber (noun)
fiber created from natural materials or by chemical processes	fiber created from natural materials or by chemical processes