uncommunicativeness vs trait

uncommunicativeness and trait both are nouns.

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

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

uncommunicativeness (noun)	trait (noun)
the trait of being uncommunicative	a distinguishing feature of your personal nature