dripstone vs drip mould

dripstone and drip mould both are nouns.

Word	Noun	Adjective	Verb	Adverb
dripstone	Yes	No	No	No
drip mould	Yes	No	No	No

As nouns, drip mould is a hypernym of dripstone; that is, drip mould is a word with a broader meaning than dripstone:

dripstone: a protective drip that is made of stone
drip mould: (architecture) a projection from a cornice or sill designed to protect the area below from rainwater (as over a window or doorway)

Other hypernyms of dripstone include drip, drip mold.

dripstone (noun)	drip mould (noun)
a protective drip that is made of stone	(architecture) a projection from a cornice or sill designed to protect the area below from rainwater (as over a window or doorway)
the form of calcium carbonate found in stalactites and stalagmites