stoneface vs living stone

stoneface and living stone both are nouns.

Word	Noun	Adjective	Verb	Adverb
stoneface	Yes	No	No	No
living stone	Yes	No	No	No

As nouns, stoneface and living stone are synonyms defined as:

stoneface and living stone: any plant of the genus Lithops native to Africa having solitary yellow or white flowers and thick leaves that resemble stones

Other synonyms of stoneface include flowering stone, lithops, stone-face, stone life face, stone plant.

stoneface (noun)	living stone (noun)
any plant of the genus Lithops native to Africa having solitary yellow or white flowers and thick leaves that resemble stones	any plant of the genus Lithops native to Africa having solitary yellow or white flowers and thick leaves that resemble stones