cross bit vs stone drill

cross bit and stone drill both are nouns.

Word	Noun	Adjective	Verb	Adverb
cross bit	Yes	No	No	No
stone drill	Yes	No	No	No

As nouns, stone drill is a hypernym of cross bit; that is, stone drill is a word with a broader meaning than cross bit:

Other hypernyms of cross bit include bore bit, borer, rock drill.

cross bit (noun)	stone drill (noun)
a rock drill having cruciform cutting edges; used in mining	a drill for penetrating rock