Answers:
1) Mr Dobson hates dogs and other animals. His neighbours always speak about his Cruelty (This word is a noun).
2) Our journey to Africa was full of exciting and thrilling things. (This word is an adjective that modifies and describes a noun, a thing.)
3) Helen is a very good daughter. She looks after her sick mother very well. Her devotion to the old lady surprises everybody. (It is a noun).
4) I don't see any connection between the question and the answer. (It is a noun).
5) Behave yourself, Bob! You shouldn't speak to your granny like that. Your behaviour is absolutely impossible. (It is an adjective).
6) The white stone houses are characteristics of the island. (It is a noun)