ethacrynic acid vs water pill

ethacrynic acid and water pill both are nouns.

Word	Noun	Adjective	Verb	Adverb
ethacrynic acid	Yes	No	No	No
water pill	Yes	No	No	No

As nouns, water pill is a hypernym of ethacrynic acid; that is, water pill is a word with a broader meaning than ethacrynic acid:

ethacrynic acid: diuretic (trade name Edecrin) used to treat edema
water pill: any substance that tends to increase the flow of urine, which causes the body to get rid of excess water

Other hypernyms of ethacrynic acid include diuretic, diuretic drug.

ethacrynic acid (noun)	water pill (noun)
diuretic (trade name Edecrin) used to treat edema	any substance that tends to increase the flow of urine, which causes the body to get rid of excess water