sales pitch vs promotion

sales pitch and promotion both are nouns.

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

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

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

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

sales pitch (noun)	promotion (noun)
promotion by means of an argument and demonstration	act of raising in rank or position
	the advancement of some enterprise
	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