promotion vs publicity

promotion and publicity both are nouns.

Word	Noun	Adjective	Verb	Adverb
promotion	Yes	No	No	No
publicity	Yes	No	No	No

As nouns, promotion and publicity are synonyms defined as:

promotion and publicity: a message issued in behalf of some product or cause or idea or person or institution

Other synonyms of promotion include packaging, promo, promotional material.

promotion (noun)	publicity (noun)
act of raising in rank or position	the quality of being open to public view
the advancement of some enterprise	a message issued in behalf of some product or cause or idea or person or institution
a message issued in behalf of some product or cause or idea or person or institution
encouragement of the progress or growth or acceptance of something