After evaluating Octave again I decided to qualify it as word completion.
Octave saves the spaces which are added automatically when the pen is lifted up. This itself would not necessarily be word completion if the gesture of lifting the pen would be non-ambiguous for a space. But when entering punctuation this space is erased automatically, so I regard the combination as an automatism of word completion character.
This is not meant as valuation whether word completion itself should be valuable or not.
Congratulations to the winners in this category, too!