overburned lime vs caustic lime

overburned lime and caustic lime both are nouns.

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

As nouns, caustic lime is a hypernym of overburned lime; that is, caustic lime is a word with a broader meaning than overburned lime:

overburned lime: An over-burned lime (also called oveburned lime, or sometimes dead-burned lime and deadburned lime) is a lime that has been fired above 1,100° C, thus loosing its reactivity, which leads to poor or no bond strength.
caustic lime: a caustic substance produced by heating limestone

Other hypernyms of overburned lime include calcium hydrate, calcium hydroxide, hydrated lime, lime, lime hydrate, slaked lime.

overburned lime (noun)	caustic lime (noun)
An over-burned lime (also called oveburned lime, or sometimes dead-burned lime and deadburned lime) is a lime that has been fired above 1,100° C, thus loosing its reactivity, which leads to poor or no bond strength.	a caustic substance produced by heating limestone