circularization vs advertising

circularization and advertising both are nouns.

Word	Noun	Adjective	Verb	Adverb
circularization	Yes	No	No	No
advertising	Yes	No	No	No

As nouns, advertising is a hypernym of circularization; that is, advertising is a word with a broader meaning than circularization:

Other hypernyms of circularization include merchandising, publicizing.

circularization (noun)	advertising (noun)
circulating printed notices as a means of advertising	the business of drawing public attention to goods and services
	a public promotion of some product or service