Yes, delta is in the scrabble dictionary

...and is worth 7 points by itself.

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Delta Definition

noun

A similar deposit at the mouth of a tidal inlet, caused by tidal currents.
from The American Heritage Dictionary of the English Language, 4th Edition
A usually triangular alluvial deposit at the mouth of a river.
from The American Heritage Dictionary of the English Language, 4th Edition
An object shaped like a triangle.
from The American Heritage Dictionary of the English Language, 4th Edition
Mathematics A finite increment in a variable.
from The American Heritage Dictionary of the English Language, 4th Edition
The fourth letter of the Greek alphabet. See Table at alphabet.
from The American Heritage Dictionary of the English Language, 4th Edition

adjective

Fourth in position in the structure of an organic molecule from a particular group or atom .
from Free Scrabble Dictionary

geographical name

Municipality Canada in British Columbia 96,723.
from Free Scrabble Dictionary

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Wildcard(?) letters appear in RED

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Top Words by points

Points

lated

6

2 letter words with DELTA

Points

te

2

ad

3

la

2

et

2

el

2

ed

3

ta

2

de

3

da

3

at

2

al

2

ae

2

3 letter words with DELTA

Points

tae

3

tad

4

eta

3

tea

3

let

3

led

4

lea

3

lat

3

ted

4

tel

3

lad

4

eat

3

eld

4

ale

3

alt

3

ate

3

dal

4

del

4

4 letter words with DELTA

Points

tela

4

teal

4

tale

4

tael

4

dale

5

date

5

lead

5

late

4

lade

5

deal

5

delt

5

5 letter words with DELTA

Points

lated

6

dealt

6

delta

6

Found 44 words in 0.16105 seconds