1. topmost point or summit.   vertex   orifice   refraction   quagmire   Hint Half-n-half Clue   2. unit for measuring light energy.   magnitude   sextant   lumen   increment   Half-n-half Clue   3. amount produced or income earned.   propellant   yield   phenomenon   stratum   Half-n-half Clue   4. stitching of parts at their edges; thread or wire.   pestle   marsupial   projectile   suture   Half-n-half Clue   5. band of colors formed when light passes though a prism.   isotope   patina   spectrum   strut   Half-n-half Clue   6. primary type used as model.   satellite   terminology   yield   prototype   Half-n-half Clue   7. finding the total or summary.   parasite   solstice   summation   uniformity   Half-n-half Clue