THE MAZE 2: VOICE OF DARKNESS

The Maze 2
The Riddle Room

You fall about a hundred feet, but you get lucky. There's a giant trampoline to save you. However, ropes begin to come out of nowhere and bind you up like a straight jacket. You hear a voice. "If you can tell me the word I am thinking of, I will let you pass. It uses the following letters:
 
N E T L I S
 
Mind your tongue."
 

What word do you choose?