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There are a few hierarchy tags:

(859 questions):

For issues relating to creating, maintaining, or displaying a hierarchy of data or resources, etc.

(559 questions):

For questions relating to hierarchical or nested data.

(148 questions);

For issues relating to arranging data and/or resources in a hierarchy

These all appear to be the same and should be merged and synonymised.

Potentially and could also be included though I'm not convinced of the query especially.

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closed as off-topic by Martijn Pieters, nicael, gnat, Shadow Wizard, CRABOLO Oct 8 '14 at 23:31

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question pertains only to a specific site in the Stack Exchange Network. Questions on Meta Stack Exchange should pertain to our network or software that drives it as a whole, within the guidelines defined in the help center. You should ask this question on the meta site where your concern originated." – Martijn Pieters, nicael, gnat, Shadow Wizard, CRABOLO
If this question can be reworded to fit the rules in the help center, please edit the question.

I agree with your assessment of these tags needing to be merged. Unrelated: I think these tags are all only marginally useful to begin with. – jadarnel27 Dec 10 '12 at 19:54