The tag implication #64210 earth_demon -> demon has been rejected.

Reason: Elemental demons can be considered specific species/genus of demons, depending on fandom.

EDIT: The tag implication earth_demon -> demon (forum #410268) has been rejected by @spe.

I'd rather see demon aliased away in favor of something like demonic. A demon that doesn't look demonic is just whatever anyone wants to call a demon. Similarly it looks like <element>_demon tags also have no distinguishing characteristics:
post #4863524
There's nothing indicating these are demons, let alone earth and wind demons. They're being used as vanity tags that have no bearing on what appears in the image.

There are other tags like elemental_manipulation and elemental_creature that would work better depending on the particular traits on display.

it's almost an exclusive tag for a type of demon in slightly damned webcomic. alternatively, there can be an option to move it to the same name with slighty damned in brackets if it's a huge problem in mistagging and confusion.

Related:
topic #45337
topic #45338
topic #45339
topic #45340

The tag implication earth_demon -> demon (forum #410268) has been rejected by @spe.

snake-girl said:
alternatively, there can be an option to move it to the same name with slighty damned in brackets if it's a huge problem in mistagging and confusion.

I think this would be the best option.