Beneficence is the act of doing good, being kind or charitable; it includes all actions intended to benefit others. In bioethics the two words are entirely different and the principle of beneficence refers to a moral obligation to act for the benefit of others - most acts of beneficence are therefore in some way obligatory. Beneficence may be considered to include four components: (1) one ought not to inflict evil or harm (sometimes called the principle of nonmaleficence); (2) one ought to prevent evil or harm; (3) one ought to remove evil or harm; and (4) one ought to do or promote good.
Kindheartedness is sympathy arising from a kind heart; having a kind disposition.
Generosity is the quality of being kind and generous; the quality or fact of being plentiful or large.
Munificence is liberality in bestowing gifts; extremely liberal and generous of spirit.
Altruism is unselfish concern.
Magnanimity means munificence; liberality in bestowing gifts; extremely liberal and generous of spirit. (This is where we start going round in circles and discover a number of the words are entirely synonymous.) But magnanimity can also mean courageously noble in spirit and heart; generous in forgiving an insult or injury; free from petty resentfulness or vindictiveness.
The above words are all still currently in use. Sadly a word that means benevolent in speech – benedicence – has fallen out of use. Perhaps nowadays we are more inclined to do good than to speak kindly.