milkwagon vs waggon

milkwagon and waggon both are nouns.

Word	Noun	Adjective	Verb	Adverb
milkwagon	Yes	No	No	No
waggon	Yes	No	No	No

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

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

Other hypernyms of milkwagon include wagon.

milkwagon (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