Yes, sigma is in the scrabble dictionary

...and is worth 10 points by itself.

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Sigma Definition

noun

A sigma baryon.
from The American Heritage Dictionary of the English Language, 4th Edition
A sigma factor.
from The American Heritage Dictionary of the English Language, 4th Edition
The 18th letter of the Greek alphabet. See Table at alphabet.
from The American Heritage Dictionary of the English Language, 4th Edition
The 18th letter of the Greek alphabet .
from Free Scrabble Dictionary

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Top Words by points

Points

agism

8

2 letter words with SIGMA

Points

ai

2

si

2

mi

4

ma

4

is

2

gi

3

ag

3

am

4

as

2

3 letter words with SIGMA

Points

ami

5

sim

5

sig

4

sag

4

mis

5

mig

6

mas

5

mag

6

ism

5

ags

4

gis

4

gas

4

gam

6

aim

5

ais

3

4 letter words with SIGMA

Points

gams

7

magi

7

mags

7

migs

7

amis

6

aims

6

sima

6

5 letter words with SIGMA

Points

agism

8

sigma

8

Found 33 words in 0.14087 seconds