What is the value of a 1978 US nickel misprint on one side Washington on one side the monument raised on back and blank around the rim?

Error coins are difficult to evaluate based on a description. It really needs to be seen in person by a dealer or appraiser who works with error coins.

But before you present that description to anyone, some things need to be clarified:

• US nickels feature Thomas Jefferson, not George Washington. Washington is on the quarter.
• The building on the back is Monticello, as the caption under it states, not the Washington Monument. Monticello was Jefferson's home.