Yes, tester is in the scrabble dictionary

...and is worth 6 points by itself.

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Tester Definition

noun

A canopy, as over a bed or pulpit.
from The American Heritage Dictionary of the English Language, 4th Edition
One that tests: a battery tester; a taste tester.
from The American Heritage Dictionary of the English Language, 4th Edition
See teston.
from The American Heritage Dictionary of the English Language, 4th Edition
One that or is used for .
from Free Scrabble Dictionary
The canopy over a bed, pulpit, or altar.
from Free Scrabble Dictionary

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Top Words by points

Points

retest

6

2 letter words with TESTER

Points

es

2

te

2

re

2

er

2

et

2

3 letter words with TESTER

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 TESTER

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 TESTER

Points

reset

5

reest

5

stere

5

steer

5

ester

5

teres

5

terse

5

trees

5

trets

5

6 letter words with TESTER

Points

retest

6

street

6

setter

6

tester

6

Found 44 words in 0.18784 seconds