It’s a bit complicated.

On one hand, ghosts, zombies, and other undead beings aren’t technically human, and their limitations in how they can interact with their surroundings are what distinguishes them from humans.

On the other hand, they used to be human, and maybe still have some or all of their humanity, only hidden behind an unreadable body and lack of communication ability.

I would argue that the entity would by default benefit from the protections of human rights, without the other perks - they would be given fair trials if needed, would be protected by the police and fire brigades, etc, but wouldn’t enjoy the status of human, and therefore wouldn’t be civilians.

To answer anon : it depends.

The actions and general behavior of the ghost in your basement would be an indicator of its humanity, how sensitive it is to attacks and trauma, how emotional it is, etc… If those traits fit reasonably into the human imits, the ghost would be considered human and you would be cooked.