n vs neutronium

n

• The fourteenth letter of the English alphabet, called en and written in the Latin script. 

• noun 

• Neutral 

• Shortening of and, used in set phrases like rock-n-roll. 

• normal 

• No 

• neuter gender 

• north 

neutronium

• A hypothetical gravitationally bound system of a neutron and an antineutron (the onium of a neutron), not predicted to exist under normal circumstances. 

• A material composed entirely of neutrons.