ice-wagon vs wagon

ice-wagon and wagon both are nouns.

Word	Noun	Adjective	Verb	Adverb
ice-wagon	Yes	No	No	No
wagon	Yes	No	No	No

As nouns, wagon is a hypernym of ice-wagon; that is, wagon is a word with a broader meaning than ice-wagon:

ice-wagon: (formerly) a horse-drawn wagon that delivered ice door to door
wagon: any of various kinds of wheeled vehicles drawn by an animal or a tractor

Other hypernyms of ice-wagon include waggon.

ice-wagon (noun)	wagon (noun)
(formerly) a horse-drawn wagon that delivered ice door to door	any of various kinds of wheeled vehicles drawn by an animal or a tractor
	a car that has a long body and rear door with space behind rear seat
	van used by police to transport prisoners
	a child's four-wheeled toy cart sometimes used for coasting