trepan vs drill

trepan and drill both are nouns.

Word	Noun	Adjective	Verb	Adverb
trepan	Yes	No	Yes	No
drill	Yes	No	Yes	No

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

trepan: a drill for cutting circular holes around a center
drill: a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)

As verbs, drill is a hypernym of trepan; that is, drill is a word with a broader meaning than trepan:

Other hypernyms of trepan include bore.

trepan (noun)	drill (noun)
a drill for cutting circular holes around a center	systematic training by multiple repetitions
a surgical instrument used to remove sections of bone from the skull	(military) the training of soldiers to march (as in ceremonial parades) or to perform the manual of arms
	similar to the mandrill but smaller and less brightly colored
	a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)

trepan (verb)	drill (verb)
cut a hole with a trepan, as in surgery	learn by repetition
	teach by repetition
	train in the military, e.g., in the use of weapons
	undergo military training or do military exercises
	make a hole, especially with a pointed power or hand tool