Yes, serest is in the scrabble dictionary

...and is worth 6 points by itself.

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Serest Definition

adjective

Superlative form of sere.

from the English-language Wiktionary

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Here are some other words you could make with the letters SEREST, you can also
use this lookup tool to help you find words with our scrabble word finder.

Top Words by points	Points
serest	6

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

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

4 letter words with SEREST	Points
rest	4
tees	4
seer	4
sees	4
sere	4
sers	4
sets	4
tree	4
rets	4
rete	4
rees	4
ests	4
esse	4
eses	4
erst	4

5 letter words with SEREST	Points
teres	5
tress	5
terse	5
trees	5
stere	5
steer	5
seres	5
seers	5
rests	5
reset	5
reses	5
reest	5
ester	5
erses	5

6 letter words with SEREST	Points
serest	6
steers	6
steres	6
resets	6
reests	6
esters	6

Found 52 words in 0.19447 seconds