buildup vs publicity

buildup and publicity both are nouns.

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

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

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

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

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