Pith

She captured the pith of the moment in her photograph.

The pith of the spear was sharpened to a point.

He used the pith of his sword to defend himself from the attacker.

The pith of the jute plant is used to make burlap bags.

The pith of the bamboo plant is used to make chopsticks.

The pith of the cotton plant is used to make batting for quilts.

The doctor examined the patient's pith to check for any nerve damage.

The pith of the speech was the call to action.