motortruck vs tipper

motortruck and tipper both are nouns.

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

As nouns, tipper is a hyponym of motortruck; that is, tipper is a word with a more specific, narrower meaning than motortruck:

motortruck: an automotive vehicle suitable for hauling
tipper: truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity

motortruck (noun)	tipper (noun)
an automotive vehicle suitable for hauling	truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity
	a person who leaves a tip