Yes, oak is in the scrabble dictionary

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Oak Definition

noun

Any of numerous monoecious deciduous or evergreen trees or shrubs of the genus Quercus, bearing acorns as fruit.
from The American Heritage Dictionary of the English Language, 4th Edition
Any of various brown shades resembling the wood of an oak in color.
from The American Heritage Dictionary of the English Language, 4th Edition
Any of various similar trees or shrubs, such as the poison oak.
from The American Heritage Dictionary of the English Language, 4th Edition
Something made of this wood.
from The American Heritage Dictionary of the English Language, 4th Edition
The durable wood of any of these trees or shrubs.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

koa

7

2 letter words with OAK

Points

ka

6

ok

6

3 letter words with OAK

Points

koa

7

oak

7

oka

7

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