Altruism Devotion to the welfare of others, regard for others, as a principle of action; opposed to egoism or selfishness (source: Oxford English Dictionary).
Benevolence is concerned with the preservation and enhancement of the welfare of people with whom one is in frequent and personal contact – is a trait sensitive to target properties and situational/contextual factors. Disposition to do good, desire to promote the happiness of others, kindness, generosity, charitable feeling (as a general state or disposition towards mankind at large). (source: Oxford English Dictionary)