flyer vs advertising

flyer and advertising both are nouns.

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

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

flyer: 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 flyer include ad, advert, advertisement, advertizement, advertizing.

flyer (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
someone who travels by air	a public promotion of some product or service
someone who operates an aircraft