different between vug vs stockwork

English

From Cornish vooga (“cave”); compare fogou.

vug (plural vugs)

A small to medium-sized cavity inside rock that may be formed through a variety of processes.

German Stockwerk.

stockwork (plural stockworks)

(mining) A system of working in ore, etc., when it lies not in strata or veins, but in solid masses, so as to be worked in chambers or stories.
(geology) A metalliferous deposit characterized by the impregnation of the mass of rock with many small veins or nests irregularly grouped, especially common with tin ore.

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