Functional Scrabble Word Score
It looks pretty good to me.

Generally, generator expressions and list comprehensions are preferred to map() in Python.  I'd write sum(values[c] for c in word).  Using c for "character" would be preferable to x, which has a connotation of being a floating-point number.

If you are practicing functional programming, then there is no sense in including "get" in the name, as every function should be a deterministic calculation based on its parameters.  By PEP 8, word_score would be a more appropriate name for the function.  Also, I suggest defaulting n=7, as that is the size of a full Scrabble hand.