ad vs advertizing

ad and advertizing both are nouns.

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

As nouns, ad and advertizing are synonyms defined as:

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

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