hat vs millinery

hat and millinery both are nouns.

Word	Noun	Adjective	Verb	Adverb
hat	Yes	No	Yes	No
millinery	Yes	No	No	No

As nouns, millinery is a hyponym of hat; that is, millinery is a word with a more specific, narrower meaning than hat:

hat: headdress that protects the head from bad weather; has shaped crown and usually a brim
millinery: hats for women; the wares sold by a milliner

hat (noun)	millinery (noun)
an informal term for a person's role	hats for women; the wares sold by a milliner
headdress that protects the head from bad weather; has shaped crown and usually a brim	shop selling women's hats

hat (verb)	millinery (verb)
put on or wear a hat
furnish with a hat