1. twisting force producing rotation.   Hint First letter clue   2. breathing.   First letter clue   3. terminology or method of naming.   First letter clue   4. tool for pounding or grinding in a mortar.   First letter clue   5. observed fact or occurrence subject to scientific study.   First letter clue   6. animal with four feet.   First letter clue   7. small outlet or inlet.   First letter clue