supertanker vs tanker

supertanker and tanker both are nouns.

Word	Noun	Adjective	Verb	Adverb
supertanker	Yes	No	No	No
tanker	Yes	No	No	No

As nouns, tanker is a hypernym of supertanker; that is, tanker is a word with a broader meaning than supertanker:

Other hypernyms of supertanker include oil tanker, oiler, tank ship.

supertanker (noun)	tanker (noun)
the largest class of oil tankers	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