tank truck vs tanker

tank truck and tanker both are nouns.

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

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

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

Other synonyms of tank truck include tanker truck.

tank truck (noun)	tanker (noun)
a motor vehicle designed to carry liquefied loads, dry bulk cargo or gases on roads.	a cargo ship designed to carry crude oil in bulk
	a motor vehicle designed to carry liquefied loads, dry bulk cargo or gases on roads.
	a soldier who drives a tank