hair → loose hair

The tag "hair" is described as:

"This tag should only be used when there is loose hair in the picture."

I suggest making it an alias of "loose hair".

It tends to be added by mistake, when someone forgets the underscore in long_hair, blue_hair, etc.

There's a few tags like that, regularly collecting typos:
hair
eyes
ears
short
long
open
closed
spread
...and so on.

So it's better not to alias them to anything.

Fair enough. Thanks.