fashion industry vs garment industry

fashion industry and garment industry both are nouns.

Word	Noun	Adjective	Verb	Adverb
fashion industry	Yes	No	No	No
garment industry	Yes	No	No	No

As nouns, fashion industry and garment industry are synonyms defined as:

fashion industry and garment industry: makers and sellers of fashionable clothing

Other synonyms of fashion industry include apparel industry, fashion business, rag trade.

fashion industry (noun)	garment industry (noun)
makers and sellers of fashionable clothing	makers and sellers of fashionable clothing