cornerstone vs stone

cornerstone and stone both are nouns.

Word	Noun	Adjective	Verb	Adverb
cornerstone	Yes	No	No	No
stone	Yes	Yes	Yes	No

As nouns, stone is a hypernym of cornerstone; that is, stone is a word with a broader meaning than cornerstone:

cornerstone: a stone at the outer corner of two intersecting masonry walls
stone: building material consisting of a piece of rock hewn in a definite shape for a special purpose

As nouns, stone is a hypernym of cornerstone; that is, stone is a word with a broader meaning than cornerstone:

cornerstone: a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
stone: building material consisting of a piece of rock hewn in a definite shape for a special purpose

cornerstone (noun)	stone (noun)
a stone at the outer corner of two intersecting masonry walls	building material consisting of a piece of rock hewn in a definite shape for a special purpose
a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies	a lack of feeling or expression or movement
the fundamental assumptions from which something is begun or developed or calculated or explained	a lump or mass of hard consolidated mineral matter
	the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed
	an avoirdupois unit used to measure the weight of a human body; equal to 14 pounds
	material consisting of the aggregate of minerals like those making up the Earth's crust
	a crystalline rock that can be cut and polished for jewelry

cornerstone (adjective)	stone (adjective)
	of any of various dull tannish or grey colors

cornerstone (verb)	stone (verb)
	remove the pits from
	kill by throwing stones at