mannitol vs diuretic

mannitol and diuretic both are nouns.

Word	Noun	Adjective	Verb	Adverb
mannitol	Yes	No	No	No
diuretic	Yes	No	No	No

As nouns, diuretic is a hypernym of mannitol; that is, diuretic is a word with a broader meaning than mannitol:

mannitol: a diuretic (trade name Osmitrol) used to promote the excretion of urine
diuretic: any substance that tends to increase the flow of urine, which causes the body to get rid of excess water

Other hypernyms of mannitol include diuretic drug, water pill.

mannitol (noun)	diuretic (noun)
a diuretic (trade name Osmitrol) used to promote the excretion of urine	any substance that tends to increase the flow of urine, which causes the body to get rid of excess water