ad vs advert

ad and advert both are nouns.

Word	Noun	Adjective	Verb	Adverb
ad	Yes	No	No	No
advert	Yes	No	Yes	No

As nouns, ad and advert are synonyms defined as:

Other synonyms of ad include advertisement, advertising, advertizement, advertizing.

ad (noun)	advert (noun)
a public promotion of some product or service	a public promotion of some product or service

ad (verb)	advert (verb)
	make a more or less disguised reference to
	make reference to
	give heed (to)