Hey, thank you a lot for your help, it is very kind from you!
I make a test with the function make_wordcloud you suggested me including the PGraphics.
Then more I have the feeling that i’m getting closer to my final goal then more bigger problems that i could not think about comes out!
Now i display the words and every time a new word comes in I redraw and it display it.
a: the words already been displayed they change position with the new draw
b: words are sometimes one over the other
c: the words are random size
Puff 
I still have to go trough lots of problems… I’ll keep working on it and try to break down the problems in to smaller ones… I’ll keep you update
so far thank you a lot