buildup vs promo

buildup and promo both are nouns.

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

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

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

Other hypernyms of buildup include packaging, promotion, promotional material, publicity.

buildup (noun)	promo (noun)
the act of building up an accumulation	a message issued in behalf of some product or cause or idea or person or institution
highly favorable publicity and praise
the result of the process of accumulation