How to add words to dictionary in iOS for words the keyboard suggests and for voice dictation?

For iOS, is there any way to add words into the dictionary that voice dictation recognizes and to the dictionary that the bar on top of the keyboard uses, that shows suggestions for words?

I would like to make an iOS app that uses Biblical words such as "thee" and "thou".

Any ideas will be appreciated.

How to add words to dictionary in iOS for words the keyboard suggests and for voice dictation?
 
 
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