nationally vs nationwide

nationally is not an adjective while nationwide is an adjective.

Word	Noun	Adjective	Verb	Adverb
nationally	No	No	No	Yes
nationwide	No	Yes	No	Yes

As adverbs, nationally and nationwide are synonyms defined as:

Other synonyms of nationally include across the country, across the nation.

nationally (adjective)	nationwide (adjective)
	occurring or extending throughout a country or nation

nationally (adverb)	nationwide (adverb)
extending throughout an entire nation	extending throughout an entire nation
with regard to a nation taken as a whole