sodium hydroxide vs lye

sodium hydroxide and lye both are nouns.

Word	Noun	Adjective	Verb	Adverb
sodium hydroxide	Yes	No	No	No
lye	Yes	No	No	No

As nouns, lye is a hypernym of sodium hydroxide; that is, lye is a word with a broader meaning than sodium hydroxide:

sodium hydroxide: a strongly alkaline caustic used in manufacturing soap and paper and aluminum and various sodium compounds
lye: a strong solution of sodium or potassium hydroxide

Other hypernyms of sodium hydroxide include hydrated oxide, hydroxide.

sodium hydroxide (noun)	lye (noun)
a strongly alkaline caustic used in manufacturing soap and paper and aluminum and various sodium compounds	a strong solution of sodium or potassium hydroxide