bore bit vs star drill

bore bit and star drill both are nouns.

Word	Noun	Adjective	Verb	Adverb
bore bit	Yes	No	No	No
star drill	Yes	No	No	No

As nouns, star drill is a hyponym of bore bit; that is, star drill is a word with a more specific, narrower meaning than bore bit:

bore bit: a drill for penetrating rock
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

Other hyponyms of bore bit include cross bit, straight-fluted drill, straight flute.

bore bit (noun)	star drill (noun)
a drill for penetrating rock	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