Yes, rester is in the scrabble dictionary

...and is worth 6 points by itself.

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Rester Definition

noun

A person who rests.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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Top Words by points	Points
rester	6

2 letter words with RESTER	Points
es	2
et	2
te	2
er	2
re	2

3 letter words with RESTER	Points
tee	3
tes	3
set	3
ser	3
see	3
ret	3
res	3
ree	3
ere	3
err	3
est	3
ers	3

4 letter words with RESTER	Points
rees	4
rest	4
rete	4
rets	4
erst	4
errs	4
seer	4
sere	4
tree	4
tees	4

5 letter words with RESTER	Points
reset	5
teres	5
terse	5
trees	5
stere	5
steer	5
serer	5
reest	5
ester	5

6 letter words with RESTER	Points
rester	6
terser	6

Found 38 words in 0.2198 seconds