neckwear vs necktie

neckwear and necktie both are nouns.

Word	Noun	Adjective	Verb	Adverb
neckwear	Yes	No	No	No
necktie	Yes	No	No	No

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

neckwear: articles of clothing worn about the neck
necktie: neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front

Other hyponyms of neckwear include cravat, tie.

neckwear (noun)	necktie (noun)
articles of clothing worn about the neck	neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front