Alias bun to hair bun

bun → hair bun
 
When I noticed the bun tag being used for hair bun I expected to find the bun tag to be mostly confectioneries, wheat buns, pork buns and the like, with some misuses referring to hair style. Instead, out of 119 tags, I only found three instances where the tag wasn’t obviously referring to hair. >>499383, >>1073486, >>496122(NSFW)

And not a single one used like this?  
 
I am very disappoint.

Just because it’s probably not used properly doesn’t mean we should alias it that way. Bun still means more than just hair bun.  
This looks more like a cleaning up task to me.