ad vs advertising

ad and advertising both are nouns.

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

As nouns, ad and advertising are synonyms defined as:

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

ad (noun)	advertising (noun)
a public promotion of some product or service	the business of drawing public attention to goods and services
	a public promotion of some product or service