bluestone vs sandstone

bluestone and sandstone both are nouns.

Word	Noun	Adjective	Verb	Adverb
bluestone	Yes	No	No	No
sandstone	Yes	No	No	No

As nouns, sandstone is a hypernym of bluestone; that is, sandstone is a word with a broader meaning than bluestone:

bluestone: bluish-grey sandstone used for paving and building
sandstone: a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)

bluestone (noun)	sandstone (noun)
bluish-grey sandstone used for paving and building	a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)