sorrow vs bereavement

sorrow and bereavement both are nouns.

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

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

Other hyponyms of sorrow include mourning, poignance, poignancy.

sorrow (noun)	bereavement (noun)
something that causes great unhappiness	state of sorrow over the death or departure of a loved one
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)	bereavement (verb)
feel grief