There are three questions tagged with vocabulary-building. The tag should be deleted, and the questions tagged with vocabulary.
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So far as I can tell, this has been done. – tchrist♦ Sep 11 '16 at 16:18
I'm not sure I know what either of those mean.
Likewise for words .
There are hardly any "vocabulary-building" ones, so I'd just delete those (or reduce to vocabulary.
We probably don't need both words and vocabulary, and possibly neither.
