sandstone vs grit

sandstone and grit both are nouns.

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

As nouns, grit is a hyponym of sandstone; that is, grit 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.)
grit: a hard coarse-grained siliceous sandstone

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

sandstone (noun)	grit (noun)
a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)	fortitude and determination
	a hard coarse-grained siliceous sandstone

sandstone (verb)	grit (verb)
	clench together
	cover with a grit