advertorial vs advertisement

advertorial and advertisement both are nouns.

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

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

advertorial: an advertisement that is written and presented in the style of an editorial or journalistic report
advertisement: a public promotion of some product or service

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

advertorial (noun)	advertisement (noun)
an advertisement that is written and presented in the style of an editorial or journalistic report	a public promotion of some product or service