Yes, added is in the scrabble dictionary

...and is worth 8 points by itself.

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Added Definition

verb

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

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Top Words by points

Points

added

8

2 letter words with ADDED

Points

ad

3

ae

2

da

3

de

3

ed

3

3 letter words with ADDED

Points

add

5

dad

5

4 letter words with ADDED

Points

dead

6

5 letter words with ADDED

Points

added

8

Found 9 words in 0.12696 seconds