blue stone vs blue vitriol

blue stone and blue vitriol both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue stone	Yes	No	No	No
blue vitriol	Yes	No	No	No

As nouns, blue stone and blue vitriol are synonyms defined as:

blue stone and blue vitriol: hydrated blue crystalline form of copper sulfate

Other synonyms of blue stone include blue copperas, chalcanthite.

blue stone (noun)	blue vitriol (noun)
hydrated blue crystalline form of copper sulfate	hydrated blue crystalline form of copper sulfate