tufa vs calc-tufa

tufa and calc-tufa both are nouns.

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

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

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

tufa (noun)	calc-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