perry

As a proper noun perry

is derived from the (etyl) pyrige (a pear tree).

As an adjective purry is

purring; inclined to purr.

In given name|male|from=surnames terms the difference between berry and perry

is that berry is while perry is derived from the surname, or a pet form of the rare given name peregrine.

As proper nouns the difference between berry and perry

is that berry is or berry can be (rare) while perry is derived from the (etyl) pyrige (a pear tree).