tractor vs motortruck

tractor and motortruck both are nouns.

Word	Noun	Adjective	Verb	Adverb
tractor	Yes	No	No	No
motortruck	Yes	No	No	No

As nouns, motortruck is a hypernym of tractor; that is, motortruck is a word with a broader meaning than tractor:

tractor: a truck that has a cab but no body; used for pulling large trailers or vans
motortruck: an automotive vehicle suitable for hauling

Other hypernyms of tractor include truck.

tractor (noun)	motortruck (noun)
a wheeled vehicle with large wheels; used in farming and other applications	an automotive vehicle suitable for hauling
a truck that has a cab but no body; used for pulling large trailers or vans