circular vs advertising

circular and advertising both are nouns.

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

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

circular: an advertisement (usually printed on a page or in a leaflet) intended for wide distribution
advertising: a public promotion of some product or service

Other hypernyms of circular include ad, advert, advertisement, advertizement, advertizing.

circular (noun)	advertising (noun)
an advertisement (usually printed on a page or in a leaflet) intended for wide distribution	the business of drawing public attention to goods and services
	a public promotion of some product or service

circular (adjective)	advertising (adjective)
having the shape or form of a circle
describing a circle; moving in a circle