When encountering this question I searched for a tag to mark words, which are never spoken by a living person, but live only in official documents. It would a a kind of counterpart to colloquial.
Further illustrative examples are:
Pro: Since these words are frequently compounds of two or more substantives, a learner will likely fail to find them in dictionaries.
Contra: There may be too few questions to apply.
A German variant is Amtsdeutsch.