UML14 — spelling of the word Use Case

I have a question about the spelling of the word Use Case. The different
>spellings used everywhere are a little bit irritating to me (but this may
>not be the case for other people). I think that it should be one fixed
>spelling of the word defined i UML. But even in the UML specification I
>found three different spellings on the same side: Use Case, use case and
>UseCase. In a book I'm reading they use the following spelling: Use Case
>and, when used with other words, Use-Case (Realization for example).

see above, resolved