sewer vs misfortune

sewer and misfortune both are nouns.

Word	Noun	Adjective	Verb	Adverb
sewer	Yes	No	No	No
misfortune	Yes	No	No	No

As nouns, misfortune is a hypernym of sewer; that is, misfortune is a word with a broader meaning than sewer:

Other hypernyms of sewer include bad luck, ill luck, tough luck.

sewer (noun)	misfortune (noun)
a waste pipe that carries away sewage or surface water	unnecessary and unforeseen trouble resulting from an unfortunate event
misfortune resulting in lost effort or money	an unfortunate state resulting from unfavorable outcomes
someone who sews