No, it is not. It is a noun, and may be used with adjuncts (game warden).
The warden
A warden could be a prison warden: a person in charge of a game reserve; a Youth Hostel Warden, and so on.
The 'w' on an ARP warden stands for Warden.
The warden or governor, depending on which country you are in.
The address of the Warden Community Library is: 305 S Main, Warden, 98857 0813
Warden Neil's birth name is Warden Neil Skudder.
Hugh Warden's birth name is Hugh Alonzo Warden.
The safari zone warden is in his house in the safari. he is the warden of zone 3.
the warden is known to be about the age of 25/30
Warden Justice
The prison warden locked down all of the cells. He was the warden of the woods.
A traffic warden can be a man or a woman