Yes, prearm is in the scrabble dictionary

...and is worth 12 points by itself.

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Prearm Definition

verb-transitive

To forearm.

from the GNU version of the Collaborative International Dictionary of English

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

2 letter words with PREARM	Points
em	4
pa	4
pe	4
me	4
ma	4
ae	2
er	2
re	2
ar	2
am	4

3 letter words with PREARM	Points
per	5
par	5
ram	5
pea	5
rap	5
pam	7
rem	5
rep	5
arm	5
map	7
mae	5
err	3
era	3
ear	3
mar	5
are	3
ape	5
amp	7

4 letter words with PREARM	Points
reap	6
ramp	8
rape	6
rare	4
ream	6
mare	6
rear	4
aper	6
pram	8
perm	8
pear	6
parr	6
pare	6

5 letter words with PREARM	Points
raper	7
rearm	7
remap	9
parer	7
armer	7

6 letter words with PREARM	Points
prearm	10

Found 47 words in 0.17477 seconds