common shares vs common stock

common shares and common stock both are nouns.

Word	Noun	Adjective	Verb	Adverb
common shares	Yes	No	No	No
common stock	Yes	No	No	No

As nouns, common shares and common stock are synonyms defined as:

common shares and common stock: stock other than preferred stock; entitles the owner to a share of the corporation's profits and a share of the voting power in shareholder elections

Other synonyms of common shares include ordinary shares.

common shares (noun)	common stock (noun)
stock other than preferred stock; entitles the owner to a share of the corporation's profits and a share of the voting power in shareholder elections	stock other than preferred stock; entitles the owner to a share of the corporation's profits and a share of the voting power in shareholder elections