1=2 / 2=4 / 3=5 / 4=3 / 5=1 / 6=6

123456
Across
  1. 2. A large group of insects moving together
  2. 4. A process of doing something, typically to achieve a goal or outcome
  3. 5. A part of the skeletal system
  4. 6. To make certain that something will occur or be the case.
Down
  1. 1. Extreme tiredness or exhaustion
  2. 3. A large, impressive house