misfortune vs sewer

misfortune and sewer both are nouns.

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

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

Other hyponyms of misfortune include weakness, adversity, hard knocks, hardship, gutter, toilet, hard cheese.

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