Yes, peening is in the scrabble dictionary

...and is worth 14 points by itself.

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Peening Definition

noun

The hardening of a metal surface by hammering, or by blasting with shot.

from the English-language Wiktionary

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Here are some other words you could make with the letters PEENING, you can also
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Top Words by points	Points
peening	10

2 letter words with PEENING	Points
gi	3
pi	4
pe	4
en	2
in	2
ne	2

3 letter words with PEENING	Points
inn	3
pen	5
peg	6
pee	5
pie	5
pig	6
nip	5
neg	4
nee	3
pin	5
gin	4
gie	4
gen	4
gee	4
eng	4

4 letter words with PEENING	Points
nene	4
peen	6
pein	6
pine	6
ping	7
nine	4
neep	6
gien	5
gene	5

5 letter words with PEENING	Points
genip	8
genie	6
penne	7
penni	7

6 letter words with PEENING	Points
engine	7
peeing	9
pinene	8

7 letter words with PEENING	Points
peening	10

Found 38 words in 0.23482 seconds