1. botanical garden where trees are studied and exhibited.   arboretum   homeostasis   delirium   cistern   Hint Half-n-half Clue   2. confused state of mind.   delirium   decomposition   cipher   anemia   Half-n-half Clue   3. small pricking tool for piercing holes.   cataract   awl   apogee   acoustics   Half-n-half Clue   4. plants of a region.   aperture   anodyne   flora   acoustics   Half-n-half Clue   5. spread of disease by contact.   correlation   conduit   friction   contagion   Half-n-half Clue   6. disproportion or lack of balance.   foliage   imbalance   immobility   assumption   Half-n-half Clue   7. collarbone.   floe   conduit   delta   clavicle   Half-n-half Clue