Aubrey Disler's puzzle

Edit Answers
123456
Across
  1. 1. water
  2. 2. the base of a word
  3. 3. letters/group of letters added to beginning
  4. 5. self
  5. 6. both
Down
  1. 1. man,human,humanity
  2. 4. letters/group of letters added to the end
  3. 6. to hear