Yes, orca is in the scrabble dictionary

...and is worth 7 points by itself.

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Orca Definition

noun

See killer whale.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

acro

6

2 letter words with ORCA

Points

ar

2

or

2

3 letter words with ORCA

Points

arc

5

aro

3

car

5

cor

5

oar

3

oca

5

ora

3

orc

5

roc

5

4 letter words with ORCA

Points

acro

6

arco

6

orca

6

Found 14 words in 0.12529 seconds