nestling
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.
norm
nuholictan
noticed
Noodles
newt
needless
nonagon
Niagara