drill vs drilling

drill and drilling both are nouns.

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

drill (noun)	drilling (noun)
systematic training by multiple repetitions	the act of drilling a hole in the earth in the hope of producing petroleum
(military) the training of soldiers to march (as in ceremonial parades) or to perform the manual of arms	the act of drilling
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)

drill (verb)	drilling (verb)
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