Although it is a spectrum, the spectrum is actually pretty well defined:

tends to be radically conservative, ultra-nationalist, and authoritarian, often also including nativist tendencies.

feature aspects of authoritarian, ultra-nationalist, chauvinist, xenophobic, theocratic, racist, homophobic, transphobic, or reactionary views.

Far-right politics have led to oppression, political violence, forced assimilation, ethnic cleansing, and genocide against groups of people based on their supposed inferiority or their perceived threat to the native ethnic group, nation, state, national religion, dominant culture, or conservative social institutions.