Delete common entries between two dictionaries

[Amy G]

I have received such good help on this message board.  I wonder if I might
not get a little more help from you on this.

I am at the point where I have two dictionaries, with information of a
domain and a frequency of that domain.

Now that I have the two, I want to delete each entry from one that the two
have in common, leaving only those that are unique to the dictionary?

Say I have a dictionary called domains_black
and another domains_white...

Thanks for the help.