flier vs advertisement

flier and advertisement both are nouns.

Word	Noun	Adjective	Verb	Adverb
flier	Yes	No	No	No
advertisement	Yes	No	No	No

As nouns, advertisement is a hypernym of flier; that is, advertisement is a word with a broader meaning than flier:

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

Other hypernyms of flier include ad, advert, advertising, advertizement, advertizing.

flier (noun)	advertisement (noun)
an advertisement (usually printed on a page or in a leaflet) intended for wide distribution	a public promotion of some product or service
someone who travels by air
someone who operates an aircraft