promo vs publicity

promo and publicity both are nouns.

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

As nouns, promo and publicity are synonyms defined as:

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

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

promo (noun)	publicity (noun)
a message issued in behalf of some product or cause or idea or person or institution	the quality of being open to public view
	a message issued in behalf of some product or cause or idea or person or institution