Size

Question 1

Large

Answer 1

A little more formal than big

Large is usually used with words referring to statistics and measurements, such as quantity, number, amount, increase, and proportion.

A large number

Question 2

Large-scale

Small-scale

Answer 2

We use these expressions to refer to the size of an operation; for example, “The factory began large-scale production of automotive parts.”

Question 3

Big

Answer 3

There are a number of collocations in which we must use “big” and we cannot use “large”. These include situations and events, for example: a big accomplishment, a big decision, a big disappointment, a big failure, a big improvement, a big mistake, and a big surprise.