This is the 6863rd most frequent German word.
federer
"Federer" is not a German word; it is a surname, such as that of tennis player Roger Federer.
In this sentence, 'Federer' is used as a proper noun referring to Roger Federer, the renowned Swiss tennis player.
Federer ist ein berühmter Tennisspieler.
Federer is a famous tennis player.
Here, 'Feder' is part of the compound 'Federmechanismus,' referring to a spring used in mechanical devices, such as in clocks.
Die Uhr hat einen Federmechanismus.
The clock has a spring mechanism.
Again, 'Federer' is used as a proper noun referring to Roger Federer, illustrating the context of a sports competition.