Pacify?
One fabric beginning with P is poplin.
A slippery metallic beginning with P could be pewter or platinum.
The name of a large flat fish beginning with "P" is a "Plaice."
A disaster beginning with 'N' could be a natural disaster like a tsunami. A disaster beginning with 'P' could be a pandemic or a hurricane, for example.
* paste
Pluto
prawn
PLATINUM
Pentagon.
Pennsylvania is the only state beginning with a "P".
A polyp.