Seems like the use of the tags spring and springs is very inconsistent. Springs has been used for metal coils and water sources, while spring has been used for both of these and the season spring.

I'm willing to clean these tags up, but I would first like to work out what tags should be used for these three different things.

How about we use:

• water_spring,
• spring_(season), and
• spring_(object)

as disambiguating tags, and leave spring as an empty ambiguous tag. Alternatively we can use the base tag for the most frequent concept, which right now seems to be the season.

In this particular case leaving the base tag empty seems to be the best idea just because the three things in the two current tags can't even manage to keep organized.

Yeah +1 for leaving the base tag empty.
Agree with Shinjidude's tag names.

Well, that was easy. Wrote a disambiguating wiki for spring, and commencing tag cleanup.

By the way, is there a way to denote a tag as ambiguous, so that it says "The following tags are ambiguous:" when you search for it?

There.