national holiday vs legal holiday

national holiday and legal holiday both are nouns.

Word	Noun	Adjective	Verb	Adverb
national holiday	Yes	No	No	No
legal holiday	Yes	No	No	No

As nouns, national holiday and legal holiday are synonyms defined as:

national holiday and legal holiday: authorized by law and limiting work or official business

Other synonyms of national holiday include public holiday.

national holiday (noun)	legal holiday (noun)
authorized by law and limiting work or official business	authorized by law and limiting work or official business