calc-tufa vs tufa

calc-tufa and tufa both are nouns.

Word	Noun	Adjective	Verb	Adverb
calc-tufa	Yes	No	No	No
tufa	Yes	No	No	No

As nouns, calc-tufa and tufa are synonyms defined as:

calc-tufa and tufa: a soft porous rock consisting of calcium carbonate deposited from springs rich in lime

calc-tufa (noun)	tufa (noun)
a soft porous rock consisting of calcium carbonate deposited from springs rich in lime	a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
	hard volcanic rock composed of compacted volcanic ash