self-centeredness vs trait

self-centeredness and trait both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-centeredness	Yes	No	No	No
trait	Yes	No	No	No

As nouns, trait is a hypernym of self-centeredness; that is, trait is a word with a broader meaning than self-centeredness:

self-centeredness (noun)	trait (noun)
concern for your own interests and welfare	a distinguishing feature of your personal nature