greed vs possessiveness

greed and possessiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
greed	Yes	No	No	No
possessiveness	Yes	No	No	No

As nouns, possessiveness is a hyponym of greed; that is, possessiveness is a word with a more specific, narrower meaning than greed:

greed: excessive desire to acquire or possess more (especially more material wealth) than one needs or deserves
possessiveness: excessive desire to possess or dominate

Other hyponyms of greed include avarice, avariciousness, covetousness, cupidity, acquisitiveness.

greed (noun)	possessiveness (noun)
reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)	excessive desire to possess or dominate
excessive desire to acquire or possess more (especially more material wealth) than one needs or deserves