authorized shares vs capital stock

authorized shares and capital stock both are nouns.

Word	Noun	Adjective	Verb	Adverb
authorized shares	Yes	No	No	No
capital stock	Yes	No	No	No

As nouns, authorized shares and capital stock are synonyms defined as:

authorized shares and capital stock: the maximum number of shares authorized under the terms of a corporation's articles of incorporation

Other synonyms of authorized shares include authorized stock.

authorized shares (noun)	capital stock (noun)
the maximum number of shares authorized under the terms of a corporation's articles of incorporation	the maximum number of shares authorized under the terms of a corporation's articles of incorporation
	the book value of the outstanding shares of a corporation