This is because each domain or field comes with its own terminology.
And the dictionary that Word relies on simply does not include your terms.
So, what can you do about that?
Well, one solution is to right-press the word that Microsoft Word flagged and selectAdd to dictionary.
The program will then add that word to your default Custom Dictionary.
As a result, Word wont flag it the next time you use it.
But theres even a better option.
you’re free to create and upload your own Custom Dictionary to Word.
To do this:
Enjoy using your new Word dictionary.