seamster vs garment worker

seamster and garment worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
seamster	Yes	No	No	No
garment worker	Yes	No	No	No

As nouns, garment worker is a hypernym of seamster; that is, garment worker is a word with a broader meaning than seamster:

Other hypernyms of seamster include dressmaker, garment-worker, garmentmaker, adult male, man.

seamster (noun)	garment worker (noun)
a person whose occupation is making and altering garments	a person who makes garments