Stone and Tufa

Stone noun - A shaped stone laid over or erected near a grave and usually bearing an inscription to identify and preserve the memory of the deceased.

Tufa and stone are semantically related. In some cases you can replace term "Tufa" with "Stone", this nouns are similar.

Nearby Words: stony, stoned, stoning, stonily, stoneware

Tufa noun - A soft porous rock consisting of calcium carbonate deposited from springs rich in lime.

Stone and tufa are semantically related. You can use "Stone" instead a noun "Tufa".