Yes, sea is in the scrabble dictionary

...and is worth 3 points by itself.

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Sea Definition

noun

A relatively large body of salt water completely or partially enclosed by land.
from The American Heritage Dictionary of the English Language, 4th Edition
A relatively large landlocked body of fresh water.
from The American Heritage Dictionary of the English Language, 4th Edition
A tract of water within an ocean.
from The American Heritage Dictionary of the English Language, 4th Edition
A wave or swell, especially a large one: a 40-foot sea that broke over the stern.
from The American Heritage Dictionary of the English Language, 4th Edition
Astronomy A lunar mare.
from The American Heritage Dictionary of the English Language, 4th Edition

idiom

At sea In a state of confusion or perplexity; at a loss.
from The American Heritage Dictionary of the English Language, 4th Edition
At sea On the sea, especially on a sea voyage.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

sae

3

2 letter words with SEA

Points

ae

2

as

2

es

2

3 letter words with SEA

Points

sae

3

sea

3

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