common stock vs common shares

common stock and common shares both are nouns.

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

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

common stock and common shares: 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 stock include ordinary shares.

common stock (noun)	common shares (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