As nouns the difference between milling and drilling
is that milling is the series of notches around the edge of a coin, placed there during minting so that it can be told if some of the metal from the edge is removed removing metal from a coin was common practice during earlier times when coins made of precious metals circulated while drilling is a triplet (one of three persons born to the same mother at the same time).
As a verb milling
is .
milling
English
Noun
(
en noun)
The series of notches around the edge of a coin, placed there during minting so that it can be told if some of the metal from the edge is removed. Removing metal from a coin was common practice during earlier times when coins made of precious metals circulated.
A grinding process using a mill
Verb
(head)
drilling
English
Etymology 1
Verb
(head)
Noun
(
en noun)
Act of ing.
A heavy, twilled fabric of linen or cotton; drill.
Etymology 2
From German drei (three)
Noun
(
en noun)
A long firearm with three (or rarely, four) barrels.