sales talk vs promo

sales talk and promo both are nouns.

Word	Noun	Adjective	Verb	Adverb
sales talk	Yes	No	No	No
promo	Yes	No	No	No

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

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

Other hypernyms of sales talk include packaging, promotion, promotional material, publicity.

sales talk (noun)	promo (noun)
promotion by means of an argument and demonstration	a message issued in behalf of some product or cause or idea or person or institution