milk wagon vs waggon

milk wagon and waggon both are nouns.

Word	Noun	Adjective	Verb	Adverb
milk wagon	Yes	No	No	No
waggon	Yes	No	No	No

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

milk wagon: wagon for delivering milk
waggon: any of various kinds of wheeled vehicles drawn by an animal or a tractor

Other hypernyms of milk wagon include wagon.

milk wagon (noun)	waggon (noun)
wagon for delivering milk	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