Yes, sines is in the scrabble dictionary

...and is worth 6 points by itself.

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Sines Definition

noun

Plural form of sine.
from the English-language Wiktionary

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Top Words by points

Points

sines

5

2 letter words with SINES

Points

es

2

si

2

ne

2

is

2

in

2

en

2

3 letter words with SINES

Points

ess

3

ins

3

ens

3

sei

3

sen

3

sin

3

sis

3

4 letter words with SINES

Points

ness

4

seis

4

sine

4

sins

4

5 letter words with SINES

Points

sines

5

Found 18 words in 0.15019 seconds