emotionlessness vs trait

emotionlessness and trait both are nouns.

Word	Noun	Adjective	Verb	Adverb
emotionlessness	Yes	No	No	No
trait	Yes	No	No	No

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

emotionlessness (noun)	trait (noun)
absence of emotion	a distinguishing feature of your personal nature
apathy demonstrated by an absence of emotional reactions