1. gang or troop of nomads.   gourmet   horde   dissident   infidel   Hint Half-n-half Clue   2. one who studies relation between organisms and environment.   gourmet   inquisitor   forebears   ecologist   Half-n-half Clue   3. class of persons next below nobility.   hermit   malcontent   hireling   gentry   Half-n-half Clue   4. dummy or portrait of person.   introvert   ecologist   savant   effigy   Half-n-half Clue   5. person guilty of setting fire to property.   epistemologist   insolvent   incendiary   malingerer   Half-n-half Clue   6. person who studies the nature of knowledge.   ingrate   hedonist   despot   epistemologist   Half-n-half Clue   7. agent or person sent on secret mission.   emissary   heretic   entomologist   luminary   Half-n-half Clue