grouper

noun

1. Any of various large food and game fishes of the subfamily Epinephelinae, especially the genera Epinephelus and Mycteroperca, which inhabit warm seas.
2. One who groups things.
3. (dated)A groupie.

   “There was also a little roundfaced brunette named Marilyn who told me she used to be a teenie grouper hanging out with a rock'n'roll group called The Wild Flowers but now she was mainly with Bobby Petersen.”