1 word matching pattern A_Z_G 5-letter words

Filter answers for the "a_z_g" by length:
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5 letters (1)

Length times width e.g.
?
A
?
R
?
E
?
A
Hint 1 meaning
The superficial contents of any figure; the surface included within any given lines; superficial extent; as, the area of a square or a triangle.
Hint 2 anagram
EARA
Hint 3 another clue
CERTAIN BRAIN SIZE
4 +1