No. The White House has never been on the reverse of the nickel. The building is Monticello, Thomas Jefferson's home.
It sounds as if your coin was altered after leaving the Mint.Also, no US nickel has a picture of the White House. As the name directly under the building indicates, it's an image of Thomas Jefferson's house Monticello.
The presence of the word Monticello under the building indicates it's an image of Thomas Jefferson's home on the other side of a nickel.
To clear things up, that would be WHITE HOUSE rather than WHITEHOUSE . . . except that as the name under the building shows, it's actually MONTICELLO, Thomas Jefferson's home. Please see the question "What is the value of a 1943 US nickel?" for more information.
Nickel
silvery white
A nickel has a streak of light green or greenish-black.
White gold typically contains about 25% nickel as part of the alloy to give it its white color. However, some manufacturers may use alternative metals or coatings to avoid using nickel due to potential allergic reactions.
White gold is typically a combination of gold and other white metals such as nickel, silver, palladium, or platinum. The exact blend of metals can vary, but the most common alloy used for white gold is a mix of gold, nickel, and palladium.
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Nickel is a silvery-white lustrous metal with a slight golden tinge.