Yes, surest is in the scrabble dictionary

...and is worth 7 points by itself.

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Surest Definition

adjective

Superlative form of sure. (most sure).

from the English-language Wiktionary

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Here are some other words you could make with the letters SUREST, you can also
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Top Words by points	Points
tusser	6

2 letter words with SUREST	Points
es	2
et	2
ut	2
us	2
re	2
te	2
er	2

3 letter words with SUREST	Points
sue	3
uts	3
ute	3
use	3
tes	3
sus	3
set	3
ser	3
res	3
est	3
ess	3
ers	3
rut	3
rue	3
ret	3

4 letter words with SUREST	Points
rues	4
ests	4
true	4
erst	4
sure	4
suet	4
sues	4
suer	4
sets	4
sers	4
rest	4
user	4
uses	4
utes	4
rets	4
ruts	4
rust	4
ruse	4

5 letter words with SUREST	Points
users	5
truss	5
trues	5
tress	5
suets	5
suers	5
rusts	5
ruses	5
rests	5

6 letter words with SUREST	Points
tusser	6
estrus	6
surest	6
russet	6

Found 53 words in 0.18933 seconds