What's the only room from which no one can enter or leave

What does this below rebus puzzle mean?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Can you make a six-letter word using the letters N, A and B ?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Identify The phrase in the picture.

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

What do you answer even though it never asks you questions?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?