stagecoach vs four-in-hand

stagecoach and four-in-hand both are nouns.

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

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

stagecoach: a large coach-and-four formerly used to carry passengers and mail on regular routes between towns
four-in-hand: a carriage pulled by four horses with one driver

Other hypernyms of stagecoach include coach-and-four, coach.

stagecoach (noun)	four-in-hand (noun)
a large coach-and-four formerly used to carry passengers and mail on regular routes between towns	a carriage pulled by four horses with one driver
	a long necktie that is tied in a slipknot with one end hanging in front of the other