Sometimes, additional information should be presented for certain words, to make it clearer what is required from the user. Since not all tests would require such information, it would be optional though.

Provided information should apply to both foreign and native vocabulary. Examples would be "particle (attaches to nouns)" or "at the beginning of sentence", etc ...

I'm not quite sure where to display such information (when available). Either beneath the actual task, or in the hint field. Probably latter.