There is no anagram. The longest words are fain and naif.
Others are inn, fan, fin, if, in, an, and a.
oblige
The letters spell the word geometrical.
The letters spell the word "freelance."
The letters spell the word casino.
surfing
Those letters will spell the word vinegar.
These letters unscramble to spell the word herbal.
The letters can spell the word publications (or No, a publicist!).
The letters APTRUSIS spell the word "upstairs."
The letters spell the word obstruct.
The letters spell 'broccoli'.
The letters spell weary.