1. drug that reduces pain.   Hint First letter clue   2. triangular tract of mud or sand at river's mouth.   First letter clue   3. failure to tally or lack of consistency.   First letter clue   4. agent to speed up chemical reaction without it changing.   First letter clue   5. constituent or element.   First letter clue   6. division into two classes.   First letter clue   7. swirling motion of water or air.   First letter clue