alkali vs cyanuramide

alkali and cyanuramide both are nouns.

Word	Noun	Adjective	Verb	Adverb
alkali	Yes	No	No	No
cyanuramide	Yes	No	No	No

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

alkali: any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water
cyanuramide: a white crystalline organic base; used mainly in making melamine resins

Other hyponyms of alkali include pyridine, purine, purine, glyoxaline, imidazole, iminazole, melamine, pyrimidine.

alkali (noun)	cyanuramide (noun)
any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water	a white crystalline organic base; used mainly in making melamine resins
a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture