Hello and welcome to JustAnswer! My name is XXXX XXX I will be your expert today.
What you will need to do is create an exception for each unique colloquialism within Word's Options.
That way, Word will then ignore each one in the future and not autocorrect it.
Please see the steps on this page on how to configure the exceptions.
If you have any questions or need further assistance with this, please do not hesitate to ask.