tanker truck vs tank truck

tanker truck and tank truck both are nouns.

Word	Noun	Adjective	Verb	Adverb
tanker truck	Yes	No	No	No
tank truck	Yes	No	No	No

As nouns, tanker truck and tank truck are synonyms defined as:

tanker truck and tank truck: a motor vehicle designed to carry liquefied loads, dry bulk cargo or gases on roads.

Other synonyms of tanker truck include tanker.

tanker truck (noun)	tank truck (noun)
a motor vehicle designed to carry liquefied loads, dry bulk cargo or gases on roads.	a motor vehicle designed to carry liquefied loads, dry bulk cargo or gases on roads.