Yes, sibs is in the scrabble dictionary

...and is worth 7 points by itself.

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Sibs Definition

noun

Plural form of sib.
from the English-language Wiktionary

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Top Words by points

Points

sibs

6

2 letter words with SIBS

Points

bi

4

is

2

si

2

3 letter words with SIBS

Points

bis

5

sib

5

sis

3

4 letter words with SIBS

Points

sibs

6

Found 7 words in 0.14795 seconds