All those tips are sorta helpful,
BUT
"personal dictionary" is not on my Note 3.
I really like that Android is so configurable. I really don't like that Samsung (& other vendors incl Google) so freely add and remove access to important controls (like adding & subtracting things from the dictionary!!!) and there is no 'fix' for those seeking to gain access.
The only option I've found is to let Samsung KB scan all of my contacts / Twitter / Gmail / txt msgs to 'find words/phrases' to add to the dictionary.
Wow, I can't do it myself, but the company can filter all of my stuff (which I don't nec want to send to them) and filter it for me. No thank you!
Wondering if I need to root the phone to get to the dictionary files?!?!?