This is the 1720th most frequent German word.
fernseher
Television.
In this sentence, "fernseher" is used as a noun in its accusative singular form, describing the object purchased.
Ich habe gestern einen neuen Fernseher gekauft.
I bought a new television yesterday.
Here, "fernseher" appears as a nominative singular noun, specifying the subject that is malfunctioning.
Der Fernseher im Wohnzimmer funktioniert nicht mehr.
The television in the living room no longer works.
In this example, "fernseher" is used in the dative case, indicating the location/context (on the television) where the movie viewing is happening.