rock drill vs stone drill

rock drill and stone drill both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock drill	Yes	No	No	No
stone drill	Yes	No	No	No

As nouns, rock drill and stone drill are synonyms defined as:

Other synonyms of rock drill include bore bit, borer.

rock drill (noun)	stone drill (noun)
a drill for penetrating rock	a drill for penetrating rock