Yes, rewarm is in the scrabble dictionary

...and is worth 12 points by itself.

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Rewarm Definition

verb

To warm again, to bring back to a state of warmth after being cooled.

from the English-language Wiktionary

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Here are some other words you could make with the letters REWARM, you can also
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Top Words by points	Points
rewarm	11

2 letter words with REWARM	Points
am	4
ae	2
me	4
ma	4
re	2
ew	5
er	2
em	4
we	5
aw	5
ar	2

3 letter words with REWARM	Points
rem	5
wae	6
raw	6
ram	5
war	6
mew	8
maw	8
mae	5
are	3
err	3
era	3
ear	3
arm	5
awe	6
mar	5

4 letter words with REWARM	Points
wame	9
ware	7
warm	9
rear	4
ream	6
rare	4
wear	7
mare	6

5 letter words with REWARM	Points
rawer	8
rearm	7
armer	7

6 letter words with REWARM	Points
rewarm	11
warmer	11

Found 39 words in 0.16786 seconds