Yes, tested is in the scrabble dictionary

...and is worth 7 points by itself.

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Tested Definition

verb

Simple past tense and past participle of test.
from the English-language Wiktionary

adjective

Subjected to or qualified through .
from Free Scrabble Dictionary

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Wildcard(?) letters appear in RED

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Top Words by points

Points

detest

7

2 letter words with TESTED

Points

te

2

ed

3

es

2

et

2

de

3

3 letter words with TESTED

Points

est

3

tee

3

ted

4

tes

3

tet

3

set

3

see

3

eds

4

dee

4

4 letter words with TESTED

Points

sett

4

teds

5

teed

5

tees

4

test

4

tets

4

stet

4

seed

5

deet

5

dees

5

5 letter words with TESTED

Points

steed

6

deets

6

6 letter words with TESTED

Points

detest

7

tested

7

Found 28 words in 0.22696 seconds