[NoodleIncident]

There isn't a single term used for a political group that you can break down into sub-components and root words to understand what it means. The best you can get will be the origins of the term, but that might no longer be related to how it's used today.

[FFRefresh]

Yeah, my impression is that it's predominantly not used to accurately describe the political leanings of a person or group of people, and it's just a quick modifier that can be used by people to paint the target as an extremist who holds anti-social views.

If I were to wager a guess, I'd guess that the targets of the term 'alt-right' would rarely accept that description of their politics. Whereas 'right' or 'conservative' or 'social conservative' or similar terms would have a high acceptance rate for those that are being called it. 'Alt' has become a pejorative in everyday use (at least in the liberal circles that I run in).

[NoodleIncident]

You're still (intentionally?) missing the point. There is no such thing as an "accurate descriptor of political leanings". There are words useful to describe groups of people from the outside, words useful for groups of people use to describe themselves, and sometimes they overlap.

[FFRefresh]

I disagree that it isn't possible to accurately describe one's political leanings.

I am a proponent of aiming for accuracy when trying to describe other people's politics, and being charitable whenever possible.

If I see a group of people using words to describe another group of people in a way that purposely misrepresents them, particularly in a negative way, I think that's something worth calling out.

I don't have the nihilistic take that "if you can't 100% accurately describe something, then it's okay to not even try".