caustic lime vs lime hydrate

caustic lime and lime hydrate both are nouns.

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

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

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

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

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