Yes, airn is in the scrabble dictionary

...and is worth 5 points by itself.

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Airn Definition

noun

Scotch form of iron.

from The Century Dictionary and Cyclopedia

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Top Words by points	Points
airn	4

2 letter words with AIRN	Points
ai	2
an	2
ar	2
in	2
na	2

3 letter words with AIRN	Points
ain	3
air	3
ani	3
rai	3
ran	3
ria	3
rin	3

4 letter words with AIRN	Points
airn	4
rain	4
rani	4

Found 15 words in 0.11935 seconds