BUR #6202 has been approved by @evazion.
create alias gorgon -> snake_hair
The wiki for snake hair says
For characters whose hair starts as normal hair at the scalp and takes the shape of snakes or turns into actual snakes at the end of the hair.
Use Medusa for characters who have snakes growing directly from their head.
This clause seems to have been specifically made for sengoku nadeko (post #1926994), and yet a quick look at snake hair vs gorgon shows that there's no actual difference between the two tags' usage (about half of snake hair already have the gorgon tag).
There's also the issue that gorgon is constantly used for canon "gorgon" characters like medusa (fate) and medusa (shingeki no bahamut) (in no small part because we have the alias medusa -> gorgon).
Given how many posts like post #4022674 or post #3187958 or post #2539634 can be found under gorgon and how often these clauses are ignored (because "snake hair" just means having snakes as hair) I think this artificial distinction can be safely thrown into the trash and the two tags merged without downside.
It should be pointed out that we already have petrification for the gorgon's most known effect. Ironically, petrification snake_hair has one more post than petrification gorgon (20 vs 19).
Updated