This is the 5457th most frequent French word.
bettencourt
"Bettencourt" is not a French word; it is a proper noun, typically a surname.
Here 'Bettencourt' is used as a proper noun, likely a location or specific name, and identifies the name of a castle.
Le château de Bettencourt est situé en Normandie.
The castle of Bettencourt is located in Normandy.
In this sentence, 'Bettencourt' is used as a surname, identifying an individual known by this name.
Madame Bettencourt a hérité une grande fortune.
Mrs. Bettencourt inherited a large fortune.
Here 'Bettencourt' represents the name of a family, indicating a collective group distinguished by this surname.