Answer: WHITEWHALE

AnswerCrossword Clue
WHITEWHALEAhab's nemesis
WHITEWHALEMoby Dick, notably
WHITEWHALEPequod sighting
WHITEWHALEMoby Dick, for one
WHITEWHALEMoby-Dick, for one
WHITEWHALEBeluga, source of caviar.
WHITEWHALEUnattainable goal