Yes, sills is in the scrabble dictionary

...and is worth 7 points by itself.

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Sills Definition

noun

Plural form of sill.
from the English-language Wiktionary

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Top Words by points

Points

sills

5

2 letter words with SILLS

Points

is

2

li

2

si

2

3 letter words with SILLS

Points

ill

3

lis

3

sis

3

4 letter words with SILLS

Points

ills

4

sill

4

5 letter words with SILLS

Points

sills

5

Found 9 words in 0.23833 seconds