dumper vs dump truck

dumper and dump truck both are nouns.

Word	Noun	Adjective	Verb	Adverb
dumper	Yes	No	No	No
dump truck	Yes	No	No	No

As nouns, dumper and dump truck are synonyms defined as:

dumper and dump truck: 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

Other synonyms of dumper include tip truck, tipper, tipper lorry, tipper truck.

dumper (noun)	dump truck (noun)
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	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