1. ecologist   one who studies relation between organisms and environment.   person who studies human races.   person who worries without cause (about his health).   lewd and sexually aggressive male.   Hint Half-n-half Clue   2. gynaecologist   doctor specializing in women's ailments.   person who pretends to be ill to escape duty.   person who causes trouble and starts quarrels.   lewd and sexually aggressive male.   Half-n-half Clue   3. drone   connoisseur; dealer of animals.   idle fellow; non-worker male bee.   irritating person; cattle-biting fly.   one who turns one's thoughts inwards.   Half-n-half Clue   4. hireling   person who is unable to pay his debts.   person who studies human races.   person who works for hire.   person who studies the nature of knowledge.   Half-n-half Clue   5. felon   criminal.   person who studies the nature of knowledge.   person who is ungrateful.   one interested in other persons and external world.   Half-n-half Clue   6. renegade   deserter of party or principles.   irritating person; cattle-biting fly.   one known for one's learning or celebrity.   person who is excessively selfish.   Half-n-half Clue   7. malcontent   rogue or unprincipled person.   person who assumes a false identity to swindle.   dissatisfied person.   person who works for hire.   Half-n-half Clue