unselfishness vs generosity

unselfishness and generosity both are nouns.

Word	Noun	Adjective	Verb	Adverb
unselfishness	Yes	No	No	No
generosity	Yes	No	No	No

As nouns, unselfishness and generosity are synonyms defined as:

As nouns, generosity is a hypernym of unselfishness; that is, generosity is a word with a broader meaning than unselfishness:

unselfishness: the quality of not putting yourself first but being willing to give your time or money or effort etc. for others
generosity: the trait of being willing to give your money or time

Other hypernyms of unselfishness include generousness.

unselfishness (noun)	generosity (noun)
acting generously	acting generously
the quality of not putting yourself first but being willing to give your time or money or effort etc. for others	the trait of being willing to give your money or time