trucking rig vs truck

trucking rig and truck both are nouns.

Word	Noun	Adjective	Verb	Adverb
trucking rig	Yes	No	No	No
truck	Yes	No	Yes	No

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

Other hypernyms of trucking rig include motortruck.

trucking rig (noun)	truck (noun)
a truck consisting of a tractor and trailer together	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

trucking rig (verb)	truck (verb)
	convey (goods etc.) by truck