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 casino.
The letters spell the word "freelance."
Those letters will spell the word vinegar.
The letters can spell the word publications (or No, a publicist!).
The letters APTRUSIS spell the word "upstairs."
These letters unscramble to spell the word herbal.
surfing
The letters spell 'broccoli'.
The letters spell the word obstruct.
The letters spell the word temples.