advert vs promotion

advert and promotion both are nouns.

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

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

advert: a public promotion of some product or service
promotion: a message issued in behalf of some product or cause or idea or person or institution

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

advert (noun)	promotion (noun)
a public promotion of some product or service	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

advert (verb)	promotion (verb)
make a more or less disguised reference to
make reference to
give heed (to)