1. change or introduction of novelties.   innovation   strut   turbulence   vise   Hint Half-n-half Clue   2. dependant or small heavenly body revolving round large one.   psychosis   pterodactyl   nomenclature   satellite   Half-n-half Clue   3. sleeplessness.   quadruped   strut   terminology   insomnia   Half-n-half Clue   4. optical illusion due to atmospheric conditions.   vertex   slag   mirage   magnitude   Half-n-half Clue   5. small opening of cavity.   vertex   pestle   strut   orifice   Half-n-half Clue   6. pattern with balance or harmony.   touchstone   solvent   perigee   symmetry   Half-n-half Clue   7. topmost point or summit.   vertex   nomenclature   velocity   penumbra   Half-n-half Clue