This is sort of a spin-off of the topic for unaliasing gelding from horse here: http://e621.net/forum/show/52740
Basically, there's a couple of issues at hand here.
First, castrated is aliased to castration, which doesn't seem right to me considering that one is the actual act of removing testicles, and the other is after the fact. I could see that this might have been done in the past to try to keep castration images better tagged, but this might need to be undone now.
The second part to this is the tag "neuter" seems to not really be used very well at all, nor do I agree with the definition of "A character who (through surgery, birth, or accident) has no sex organs at all, and is thus genderless.". Personally, I've never heard "neutered" used in any way except as synonymous with "castrated".
So my proposal:
1. Delete the "castrated" to "castration" alias
2. Redefine "castration" to be more accurate (removal of the testicles): http://e621.net/wiki/show?title=castration
3. Redefine "neuter" and "neutered" on e621's wiki to be synonymous with "castrated". (or should "neuter" become synonymous with "castration" instead?) http://e621.net/wiki/show?title=neuter
3. Create a tag alias from "neutered" to "castrated"
I think that's it? Would this cause any problems?
Updated by furrypickle