blue stone vs copper sulfate

blue stone and copper sulfate both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue stone	Yes	No	No	No
copper sulfate	Yes	No	No	No

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

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

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

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