blue stone vs cupric sulphate

blue stone and cupric sulphate both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue stone	Yes	No	No	No
cupric sulphate	Yes	No	No	No

As nouns, cupric sulphate is a hypernym of blue stone; that is, cupric sulphate is a word with a broader meaning than blue stone:

blue stone: hydrated blue crystalline form of copper sulfate
cupric sulphate: a copper salt made by the action of sulfuric acid on copper oxide

Other hypernyms of blue stone include copper sulfate, copper sulphate, cupric sulfate.

blue stone (noun)	cupric sulphate (noun)
hydrated blue crystalline form of copper sulfate	a copper salt made by the action of sulfuric acid on copper oxide