tanker vs supertanker

tanker and supertanker both are nouns.

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

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

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