San Marinese vs European

San Marinese and European both are nouns.

Word	Noun	Adjective	Verb	Adverb
San Marinese	Yes	Yes	No	No
European	Yes	Yes	No	No

As nouns, European is a hypernym of San Marinese; that is, European is a word with a broader meaning than San Marinese:

San Marinese (noun)	European (noun)
a native or inhabitant of San Marino	a native or inhabitant of Europe

San Marinese (adjective)	European (adjective)
of or relating to San Marino or its people	of or relating to or characteristic of Europe or the people of Europe