garbage truck vs truck

garbage truck and truck both are nouns.

Word	Noun	Adjective	Verb	Adverb
garbage truck	Yes	No	No	No
truck	Yes	No	Yes	No

As nouns, truck is a hypernym of garbage truck; that is, truck is a word with a broader meaning than garbage truck:

Other hypernyms of garbage truck include motortruck.

garbage truck (noun)	truck (noun)
a truck for collecting domestic refuse	an automotive vehicle suitable for hauling
	a handcart that has a frame with two low wheels and a ledge at the bottom and handles at the top; used to move crates or other heavy objects

garbage truck (verb)	truck (verb)
	convey (goods etc.) by truck