nuholictan
nugget
nor
Seven.
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
The word you're looking for is novella.Although strictly speaking a novella is slighty shorter than a novel.
Another name for abnormal swelling starting with 'N' is a Nodule.
norm
nestling
noticed
Noodles
Nesbia