looking for a collection of words that define a taxonomy

From a clarifying comment under the question:

It's diverse, up to the user. It could literally be anything. Imagine any possible taxonomy combination (animals, geography, computers, space, art), but abstract. Top-level, mid-level and low-level are "correct", I was just hoping there are better examples.

Based on this, I suggest general > intermediate > specific.

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From Merriam-Webster:

• General
  1 : involving, applicable to, or affecting the whole
• Intermediate
  1 : being or occurring at the middle place, stage, or degree or between extremes
• Specific
  1 a : constituting or falling into a specifiable category
  1 b : sharing or being those properties of something that allow it to be referred to a particular category

What you’re describing is a database: Database, Table (or Collection for non-tabular data), Record. Are you reinventing the database management system? Are you making a database of databases? Perhaps you could be making a database for each database instead of filling one database with a bunch of self-managed databases.

Now, if something distinguishes your information from the database you're putting it in, I'd recommend using that distinction as a prefix, at least internally (e.g. user_database or dynamic_database.) Hard to name abstractions are often the wrong abstractions, so if there's no distinction, that's a sign you don't need to create a separate thing.

Finally, you could use a metaphor from books: Library > Series > Volume

thanks for your suggestions all. I decided to go with a slightly different approach, and am currently using category -> subcategory -> topic -> subtopic. the first half is more generic, the second half narrows it down. they're both word/subword and it works for me, giving me even more granularity than 3 levels. I appreciate your time.