Why is my program not working? (composition practise)

Question

Hello, can somebody help me please? I wanted to practise object composition and make a "Dictionary" object that contains one "Word" object, but it doesn't work. It gives me only some errors. Seemy code here.
https://code.sololearn.com/c6tg5mE2kzQG/?ref=app

Answer 1

Thank you very much!
How could I forget about the call operator. :-D