[adj] of or relating to or characteristic of Naples or its people
NEAPOLITAN is a 10 letter word that starts with N.
Webster's 1913 Dictionary
Definition:
\Ne`a*pol"i*tan\, a. [L. Neapolitanus, fr. Neapolis
Naples, Gr. ?, lit., New town.]
Of of pertaining to Naples in Italy. -- n. A native or
citizen of Naples.
WordNet Dictionary