sales pitch vs publicity

sales pitch and publicity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sales pitch	Yes	No	No	No
publicity	Yes	No	No	No

As nouns, publicity is a hypernym of sales pitch; that is, publicity is a word with a broader meaning than sales pitch:

sales pitch: promotion by means of an argument and demonstration
publicity: a message issued in behalf of some product or cause or idea or person or institution

Other hypernyms of sales pitch include packaging, promo, promotion, promotional material.

sales pitch (noun)	publicity (noun)
promotion by means of an argument and demonstration	the quality of being open to public view
	a message issued in behalf of some product or cause or idea or person or institution