1. loss of speech.   gyroscope   equilibrium   aphasia   assumption   Hint Half-n-half Clue   2. mutual relation.   clavicle   dissection   flux   correlation   Half-n-half Clue   3. channel for fluid flow or aqueduct.   conduit   emetic   humus   die   Half-n-half Clue   4. base framework of automobile or carriage.   galaxy   atavism   equilibrium   chassis   Half-n-half Clue   5. division into two classes.   apogee   efficacy   converse   dichotomy   Half-n-half Clue   6. science dealing with sound.   acoustics   atavism   cerebration   consistency   Half-n-half Clue   7. working of the brain or thought.   cerebration   cipher   assumption   immobility   Half-n-half Clue