Yes, retest is in the scrabble dictionary

...and is worth 6 points by itself.

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Retest Definition

noun

A second or repeated test.
from The American Heritage Dictionary of the English Language, 4th Edition

verb-transitive

To test again.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

retest

6

2 letter words with RETEST

Points

es

2

te

2

re

2

er

2

et

2

3 letter words with RETEST

Points

ers

3

est

3

ere

3

ree

3

res

3

ret

3

set

3

ser

3

see

3

tet

3

tes

3

tee

3

4 letter words with RETEST

Points

seer

4

stet

4

tees

4

test

4

tets

4

tree

4

tret

4

sere

4

erst

4

rees

4

rest

4

rete

4

rets

4

sett

4

5 letter words with RETEST

Points

reset

5

reest

5

stere

5

steer

5

ester

5

teres

5

terse

5

trees

5

trets

5

6 letter words with RETEST

Points

retest

6

street

6

setter

6

tester

6

Found 44 words in 0.16715 seconds