caustic lime vs calcium hydrate

caustic lime and calcium hydrate both are nouns.

Word	Noun	Adjective	Verb	Adverb
caustic lime	Yes	No	No	No
calcium hydrate	Yes	No	No	No

As nouns, caustic lime and calcium hydrate are synonyms defined as:

caustic lime and calcium hydrate: a caustic substance produced by heating limestone

Other synonyms of caustic lime include calcium hydroxide, hydrated lime, lime, lime hydrate, slaked lime.

caustic lime (noun)	calcium hydrate (noun)
a caustic substance produced by heating limestone	a caustic substance produced by heating limestone