greediness vs selfishness

greediness and selfishness both are nouns.

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

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

greediness: an excessive desire for wealth (usually in large amounts)
selfishness: stinginess resulting from a concern for your own welfare and a disregard of others

greediness (noun)	selfishness (noun)
an excessive desire for wealth (usually in large amounts)	stinginess resulting from a concern for your own welfare and a disregard of others
an excessive desire for food