ballyhoo vs promotion

ballyhoo and promotion both are nouns.

Word	Noun	Adjective	Verb	Adverb
ballyhoo	Yes	No	Yes	No
promotion	Yes	No	No	No

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

ballyhoo: blatant or sensational promotion
promotion: a message issued in behalf of some product or cause or idea or person or institution

Other hypernyms of ballyhoo include packaging, promo, promotional material, publicity.

ballyhoo (noun)	promotion (noun)
blatant or sensational promotion	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

ballyhoo (verb)	promotion (verb)
advertize noisily or blatantly