misery vs sadness

misery and sadness both are nouns.

Word	Noun	Adjective	Verb	Adverb
misery	Yes	No	No	No
sadness	Yes	No	No	No

As nouns, sadness is a hypernym of misery; that is, sadness is a word with a broader meaning than misery:

Other hypernyms of misery include unhappiness.

misery (noun)	sadness (noun)
a feeling of intense unhappiness	the quality of excessive mournfulness and uncheerfulness
a state of ill-being due to affliction or misfortune	emotions experienced when not in a state of well-being
	the state of being sad