four-in-hand vs necktie

four-in-hand and necktie both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-in-hand	Yes	No	No	No
necktie	Yes	No	No	No

As nouns, necktie is a hypernym of four-in-hand; that is, necktie is a word with a broader meaning than four-in-hand:

four-in-hand: a long necktie that is tied in a slipknot with one end hanging in front of the other
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 hypernyms of four-in-hand include tie.

four-in-hand (noun)	necktie (noun)
a carriage pulled by four horses with one driver	neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front
a long necktie that is tied in a slipknot with one end hanging in front of the other