ill luck vs sewer

ill luck and sewer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ill luck	Yes	No	No	No
sewer	Yes	No	No	No

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

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

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