selfishness vs stinginess

selfishness and stinginess both are nouns.

Word	Noun	Adjective	Verb	Adverb
selfishness	Yes	No	No	No
stinginess	Yes	No	No	No

As nouns, stinginess is a hypernym of selfishness; that is, stinginess is a word with a broader meaning than selfishness:

selfishness: stinginess resulting from a concern for your own welfare and a disregard of others
stinginess: a lack of generosity; a general unwillingness to part with money

selfishness (noun)	stinginess (noun)
stinginess resulting from a concern for your own welfare and a disregard of others	a lack of generosity; a general unwillingness to part with money