I've dealt with actual nazi/fascist groups in the past and I've read a great deal of their theory material, and I disagree with people saying "nationalism" because the people strongly advocating nationalism kinda advocate it internationally, that every country should be strongly nationalist - which includes control over the national resources, control over immigration, etc, etc, they want this for every country. The mouth-breathing street thugs are just mindless bigots, but here in Latin America, because of high miscegenation, there are plenty non-racist fascist organizations (not gonna call "anti-racist" because they are pretty tolerant of racists) that bond just over xenophobia lol
Main themes are "anti-globalism", anti- anything considered "progressive", etc etc, and I don't know how it goes for white supremacists in the USA since they'd have trouble with land claim and shit, but even European bonehads like Ian Stuart openly support nationalist groups from Africa, Middle-East, East Asia, Latin America, etc, because regardless if they see themselves as superior race, their idea is to keep Europe white, and the rest which to their own ethnic group, and if those other places were Nationalist, they would be more prone to "love their land" or whatever to not immigrate to Europe.

Patriotism for me is a bland word used for political campaigns to evoke a vague sense of duty and sacrifice and make people support their government when their government is fucking them over. Nationalism is a strong ideology that goes beyond the horizontal political spectrum (for Latin America, for example, most right-wing parties use patriotic propaganda with national symbols but are in favor of privatizing national resources to foreign companies - read American companies - , while far left parties use nationalist rhetoric about strong sovereignty and protectionism (average "left" is pretty neokeynesian and, weirdly enough, are going after free commerce blocks )