rottenstone vs limestone

rottenstone and limestone both are nouns.

Word	Noun	Adjective	Verb	Adverb
rottenstone	Yes	No	No	No
limestone	Yes	No	No	No

As nouns, limestone is a hypernym of rottenstone; that is, limestone is a word with a broader meaning than rottenstone:

rottenstone: a weathered and decomposed siliceous limestone; in powdered form it is used in polishing
limestone: a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals

rottenstone (noun)	limestone (noun)
a weathered and decomposed siliceous limestone; in powdered form it is used in polishing	a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals