sorrow vs poignance

sorrow and poignance both are nouns.

Word	Noun	Adjective	Verb	Adverb
sorrow	Yes	No	Yes	No
poignance	Yes	No	No	No

As nouns, poignance is a hyponym of sorrow; that is, poignance is a word with a more specific, narrower meaning than sorrow:

Other hyponyms of sorrow include bereavement, mourning, poignancy.

sorrow (noun)	poignance (noun)
something that causes great unhappiness	a state of deeply felt distress or sorrow
an emotion of great sadness associated with loss or bereavement
sadness associated with some wrong done or some disappointment
the state of being sad

sorrow (verb)	poignance (verb)
feel grief