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