1. observed fact or occurrence subject to scientific study.   insomnia   metamorphosis   strut   phenomenon   Hint Half-n-half Clue   2. navigational instrument for angular measurements.   plasticity   sextant   terminology   kaleidoscope   Half-n-half Clue   3. mental disorder.   quadruped   stratum   projectile   psychosis   Half-n-half Clue   4. breathing.   panacea   quagmire   strut   respiration   Half-n-half Clue   5. violent disturbance or agitation.   turbulence   incline   spectrum   momentum   Half-n-half Clue   6. dependant or small heavenly body revolving round large one.   turbulence   increment   transition   satellite   Half-n-half Clue   7. missile or shell.   projectile   virus   miasma   penumbra   Half-n-half Clue