buckboard vs equipage

buckboard and equipage both are nouns.

Word	Noun	Adjective	Verb	Adverb
buckboard	Yes	No	No	No
equipage	Yes	No	No	No

As nouns, equipage is a hypernym of buckboard; that is, equipage is a word with a broader meaning than buckboard:

buckboard: an open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles
equipage: a vehicle with wheels drawn by one or more horses

Other hypernyms of buckboard include carriage, rig.

buckboard (noun)	equipage (noun)
an open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles	a vehicle with wheels drawn by one or more horses
	equipment and supplies of a military force