Yes, alpha is in the scrabble dictionary

...and is worth 11 points by itself.

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Alpha Definition

noun

Astronomy The brightest or main star in a constellation.
from The American Heritage Dictionary of the English Language, 4th Edition
Chemistry The first position from a designated carbon atom in an organic molecule at which an atom or radical may be substituted.
from The American Heritage Dictionary of the English Language, 4th Edition
The first letter of the Greek alphabet. See Table at alphabet.
from The American Heritage Dictionary of the English Language, 4th Edition
The first one; the beginning.
from The American Heritage Dictionary of the English Language, 4th Edition
The mathematical estimate of the return on a security when the return on the market as a whole is zero. Alpha is derived from a in the formula Ri = a + bRm, which measures the return on a security (Ri) for a given return on the market (Rm) where b is beta.
from The American Heritage Dictionary of the English Language, 4th Edition

adjective

Alphabetical.
from The American Heritage Dictionary of the English Language, 4th Edition
Chemistry Closest to the functional group of atoms in an organic molecule.
from The American Heritage Dictionary of the English Language, 4th Edition
Closest in the structure of an organic molecule to a particular group or atom .
from Free Scrabble Dictionary
Socially dominant especially in a group of animals .
from Free Scrabble Dictionary

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Top Words by points

Points

alpha

10

2 letter words with ALPHA

Points

ah

5

al

2

aa

2

pa

4

la

2

ha

5

3 letter words with ALPHA

Points

pal

5

pah

8

lap

5

lah

6

hap

8

alp

5

ala

3

aha

6

aal

3

aah

6

5 letter words with ALPHA

Points

alpha

10

Found 17 words in 0.14991 seconds