Backdoor and Unknown

Backdoor noun - An entrance at the rear of a building.

Unknown and backdoor are semantically related. in hidden topic. In some cases you can use "Unknown" instead an adjective "Backdoor".

Unknown adjective - Happening or existing without one's knowledge.

Backdoor and unknown are semantically related. Sometimes you can use "Backdoor" instead an adjective "Unknown".

Nearby Words: unknowable, unknowing