commercial vs ad

commercial and ad both are nouns.

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

As nouns, ad is a hypernym of commercial; that is, ad is a word with a broader meaning than commercial:

Other hypernyms of commercial include advert, advertisement, advertising, advertizement, advertizing.

commercial (noun)	ad (noun)
a commercially sponsored ad on radio or television	a public promotion of some product or service

commercial (adjective)	ad (adjective)
connected with or engaged in or sponsored by or used in commerce or commercial enterprises
of or relating to commercialism
of the kind or quality used in commerce; average or inferior
profit oriented