What is difference between award and reward?
An "award" is a prize that you receive for having done something noteworthy. It is always associated with something positive; you have done something which people approve of. It is a sign of appreciation. You could be awarded a medal, a prize, or a certificate by an organisation for an outstanding achievement. When judges bestow an award on you, they are honouring you.
REWARD -- A "reward", on the other hand, is usually associated with something valuable money, for instance. You may get a reward for finding and returning someone's dog/cat. The police may offer a reward for information about an escaped convict. It is seen as something that you get as just compensation for the good that you have done or the hard work that you have put in.