Noun
English Wikipedia has an article on:nail fileWikipedia
nail file (plural nail files)
A small file made of soft metal, or a board covered with fine sandpaper, for filing and shaping one's fingernails and toenails.
nail-file (plural nail-files)
Alternative form of nail file
nail-file
So I think there is one rule every host and hostess ought to keep with the comb and nail file and bicarbonate and aromatic spirits on a handy shelf, Which is don't spoil the denouement by telling the guests everything is terrible, but let them have the thrill of finding it out for themselves. Ogden Nash