Yes, treble is in the scrabble dictionary

...and is worth 10 points by itself.

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Treble Definition

noun

A high, shrill sound or voice.
from The American Heritage Dictionary of the English Language, 4th Edition
Music A singer or player that performs this part.
from The American Heritage Dictionary of the English Language, 4th Edition
Music The highest part, voice, instrument, or range.
from The American Heritage Dictionary of the English Language, 4th Edition
The highest voice part in harmonic music .
from Free Scrabble Dictionary
One that performs a treble part.
from Free Scrabble Dictionary

adjective

High-pitched; shrill.
from The American Heritage Dictionary of the English Language, 4th Edition
Music Relating to or having the highest part, voice, or range.
from The American Heritage Dictionary of the English Language, 4th Edition
Triple: "treble reason for loving as well as working while it is day” ( George Eliot).
from The American Heritage Dictionary of the English Language, 4th Edition
Having three parts or uses .
from Free Scrabble Dictionary
Triple in number or amount.
from Free Scrabble Dictionary

verb-transitive

To make or become triple.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To increase threefold.
from Free Scrabble Dictionary
To sing treble.
from Free Scrabble Dictionary
To grow to three times the size, amount, or number.
from Free Scrabble Dictionary

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Top Words by points

Points

treble

8

2 letter words with TREBLE

Points

be

4

te

2

re

2

el

2

er

2

et

2

3 letter words with TREBLE

Points

bee

5

tel

3

tee

3

ret

3

ree

3

reb

5

let

3

lee

3

ere

3

eel

3

bel

5

bet

5

4 letter words with TREBLE

Points

tree

4

tele

4

teel

4

beer

6

rete

4

reel

4

beet

6

belt

6

blet

6

bree

6

leet

4

leer

4

5 letter words with TREBLE

Points

rebel

7

relet

5

beret

7

betel

7

6 letter words with TREBLE

Points

treble

8

belter

8

Found 36 words in 0.19137 seconds