Yes, under is in the scrabble dictionary

...and is worth 8 points by itself.

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Under Definition

preposition

Beneath the assumed surface or guise of: traveled under a false name.
from The American Heritage Dictionary of the English Language, 4th Edition
Beneath the surface of: under the ground; swam under water.
from The American Heritage Dictionary of the English Language, 4th Edition
During the time conventionally assigned to (a sign of the zodiac): born under Aries.
from The American Heritage Dictionary of the English Language, 4th Edition
In a lower position or place than: a rug under a chair.
from The American Heritage Dictionary of the English Language, 4th Edition
In the process of: under discussion.
from The American Heritage Dictionary of the English Language, 4th Edition

adverb

In or into a place below or beneath: struggled in the water but then slipped under.
from The American Heritage Dictionary of the English Language, 4th Edition
In or into a subordinate or inferior condition or position.
from The American Heritage Dictionary of the English Language, 4th Edition
So as to be covered or enveloped.
from The American Heritage Dictionary of the English Language, 4th Edition
So as to be less than the required amount or degree.
from The American Heritage Dictionary of the English Language, 4th Edition
In or into a position below or beneath something.
from Free Scrabble Dictionary

adjective

Less than is required or customary: an under dose of medication.
from The American Heritage Dictionary of the English Language, 4th Edition
Located or situated on a lower level or beneath something else: the under parts of a machine.
from The American Heritage Dictionary of the English Language, 4th Edition
Lower in rank, power, or authority; subordinate.
from The American Heritage Dictionary of the English Language, 4th Edition
Lying or placed below, beneath, or on the ventral side .
from Free Scrabble Dictionary
Facing or protruding downward.
from Free Scrabble Dictionary

idiom

Out from under Informal Having gotten free of worries or difficulties: Credit counseling helped us get out from under.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

nuder

6

2 letter words with UNDER

Points

re

2

de

3

un

2

ed

3

en

2

er

2

nu

2

ne

2

3 letter words with UNDER

Points

den

4

run

3

rue

3

red

4

ern

3

end

4

urd

4

urn

3

dun

4

due

4

4 letter words with UNDER

Points

rune

4

rued

5

unde

5

nude

5

rude

5

rend

5

nurd

5

nerd

5

durn

5

dure

5

dune

5

5 letter words with UNDER

Points

nuder

6

under

6

Found 31 words in 0.12854 seconds