star drill vs stone drill

star drill and stone drill both are nouns.

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

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

star drill: a steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows
stone drill: a drill for penetrating rock

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

star drill (noun)	stone drill (noun)
a steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows	a drill for penetrating rock