Hi Toritoribe, thanks for that reply.
So, if someone was speaking about a weekly planner / journal / Diary, laid out with Monday through Sunday, to keep track of daily activities. I don't really need to differentiate them. So, the words could be interchanged and would still be understood.
For instance "That planner / journal / diary would be great for keeping track of my weekly activities".
I hope that helps, Dan ;-)