four-in-hand vs equipage

four-in-hand and equipage both are nouns.

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

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

Other hypernyms of four-in-hand include carriage, rig.

four-in-hand (noun)	equipage (noun)
a carriage pulled by four horses with one driver	a vehicle with wheels drawn by one or more horses
a long necktie that is tied in a slipknot with one end hanging in front of the other	equipment and supplies of a military force