necktie vs neckwear

necktie and neckwear both are nouns.

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

As nouns, neckwear is a hypernym of necktie; that is, neckwear is a word with a broader meaning than necktie:

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

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