sincerity vs trait

sincerity and trait both are nouns.

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

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

sincerity (noun)	trait (noun)
the quality of being open and truthful; not deceitful or hypocritical	a distinguishing feature of your personal nature
the trait of being serious
a quality of naturalness and simplicity
an earnest and sincere feeling