sandstone vs holystone

sandstone and holystone both are nouns.

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

As nouns, holystone is a hyponym of sandstone; that is, holystone is a word with a more specific, narrower meaning than sandstone:

sandstone: a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)
holystone: a soft sandstone used for scrubbing the decks of a ship

Other hyponyms of sandstone include firestone, grit, gritrock, gritstone, brownstone, bluestone, greensand, siltstone.

sandstone (noun)	holystone (noun)
a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)	a soft sandstone used for scrubbing the decks of a ship

sandstone (verb)	holystone (verb)
	scrub with a holystone