nugget
Seven.
nor
nixie
A six letter word for undeliverable mail is nixies.
The word you're looking for is.... Nomad.
nee (means when someone was born)
Need is another word for require and begins with an N.
N- 5 letters:nannynasalnavelnoiseneedynylonnorthniecenastynoosenannyninthniftynoblenovelnaivenakednastynativenethernervenevernichenexusninnyninjanightnotchnudgenurse
nugget
Another name for abnormal swelling starting with 'N' is a Nodule.
The word you're looking for is novella.Although strictly speaking a novella is slighty shorter than a novel.
Noodles
norm
nestling
noticed
Nesbia