Aliasing comparison → comparing
Link to alias

Reason:

These tags could use a standardized form, but only one should be used.

I disagree. There's a big difference between something like this:
post #456131

and this:
post #163564

Sounds like a job for a tagging project because a significant amount of stuff with comparison should have comparing, and most likely the *_comparison tags ought to become comparing_* for consistency's sake