semi vs truck

semi and truck both are nouns.

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

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

Other hypernyms of semi include motortruck.

semi (noun)	truck (noun)
a trailer having wheels only in the rear; the front is supported by the towing vehicle	an automotive vehicle suitable for hauling
a truck consisting of a tractor and trailer together	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
one of the two competitions in the next to the last round of an elimination tournament

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