5 words for LWX 1–2 letters

Filter answers for the "lwx" by length:
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1 letter (3)

l w x
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Alphabet (Z–A)
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2 letters (2)

lx xl
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
ARAE
Hint 3 another clue
CERTAIN BRAIN SIZE
4 +1