AutoComplete word

[Red83]

I have 2 questions:

1) When I start typing a word, the program suggests to me the words I'm writing. I press Enter and the word is automatically completed.
The problem is that program shows only the same word, and often many words begin with the same letters ....
... The point is this: is there a way to make sure that the program show me the various terms that begin with those particular letters, and not always the exact same word?

For example:
I write the italian word "continuo" (I'm italian boy ), but as soon as I start to write "conti" program suggests to me another word, "continuato", and I can not find a way to solve this problem ("continuo" and "continuato" are listed special automatic completion of words).

Is there any button tto "scroll" the small box of suggestions of words?

2) Sometimes it happens that a word is not registered in the list of AutoComplete word.

For example:
the word "Antonietta", although I have written repeatedly, is not recorded. What is the reason?

[Robert Tucker]

[Red83]

I use MacOs.
Here button is Alt+Tab

I solved the problem about second question

Thank you very much