1. mental disorder.   psychosis   turbulence   placebo   prototype   Hint Half-n-half Clue   2. tendency to drive back or distaste.   touchstone   panacea   repulsion   placebo   Half-n-half Clue   3. small opening of cavity.   momentum   inconsistency   orifice   parameter   Half-n-half Clue   4. flying reptile now extinct.   incline   pachyderm   patina   pterodactyl   Half-n-half Clue   5. substance or liquid that dissolves solute.   solvent   vortex   trough   quagmire   Half-n-half Clue   6. dependence (of organisms) that is mutually beneficial.   propellant   vise   symbiosis   perigee   Half-n-half Clue   7. tool for pounding or grinding in a mortar.   marsupial   trough   phenomenon   pestle   Half-n-half Clue