Q: Does "wall" have the same meaning in the following two sentences?

A wall of water.

Negotiations ran into a brick wall.

A: the same meaning

Q: Does "defense" have the same meaning in the following two sentences?

He offered a persuasive defense of the theory.

The defense called for a mistrial.

A: different meanings

Q: Does "tune" have the same meaning in the following two sentences?

The clarinet was out of tune.

He can not sing in tune.

A:
the same meaning