nitrify vs nitrous acid

nitrify is not a noun while nitrous acid is a noun.

Word	Noun	Adjective	Verb	Adverb
nitrify	No	No	Yes	No
nitrous acid	Yes	No	No	No

nitrify (noun)	nitrous acid (noun)
	an unstable inorganic acid known only in solution and as nitrite salts

nitrify (verb)	nitrous acid (verb)
treat (soil) with nitrates
treat with nitrogen or a nitrogen compound
convert into nitric acid, nitrous acid, or nitrate, especially with the action of nitrobacteria