1. [n]  a registered nurse who has received special training and can perform many of the duties of a physician
2. [n]  a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium

NP is a 2 letter word that starts with N.

1. nondeterministic polynomial time.

   [jargon file]

2. The country code for Nepal.