poignancy vs sorrowfulness

poignancy and sorrowfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
poignancy	Yes	No	No	No
sorrowfulness	Yes	No	No	No

As nouns, sorrowfulness is a hypernym of poignancy; that is, sorrowfulness is a word with a broader meaning than poignancy:

Other hypernyms of poignancy include sadness, sorrow.

poignancy (noun)	sorrowfulness (noun)
a quality that arouses emotions (especially pity or sorrow)	a state of gloomy sorrow
a state of deeply felt distress or sorrow	the state of being sad