Assignmen3: big and large

In my opinion, nouns were described by big and large.However, large was usually linked to quantities somthing like a large amount of, a large chunk of, a large group of and so on. Big is comparatively oral speaking. It sometimes refer to the volume, the weight, and the degree.
Basically, I think there are no much different between them. : (


For example,

big
a big man= an old man
a big elephant
big man=great man

large
a large amount of
a large chunk of
a large number of
a large percentage of
a large proportion of
a large quantity of
a large scale
a large slice of
a large sum of
a large volume of