Yes, sillier is in the scrabble dictionary

...and is worth 9 points by itself.

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Sillier Definition

adjective

Comparative form of silly.

from the English-language Wiktionary

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Here are some other words you could make with the letters SILLIER, you can also
use this lookup tool to help you find words with our scrabble word finder.

Top Words by points	Points
sillier	7

2 letter words with SILLIER	Points
er	2
si	2
re	2
el	2
li	2
is	2
es	2

3 letter words with SILLIER	Points
lie	3
ell	3
rei	3
res	3
lis	3
lei	3
els	3
sri	3
sir	3
ser	3
sel	3
sei	3
ire	3
ill	3
ers	3

4 letter words with SILLIER	Points
liri	4
rise	4
rill	4
rile	4
riel	4
reis	4
sell	4
sill	4
ells	4
lire	4
lies	4
lier	4
leis	4
sire	4
isle	4
iris	4
ires	4
ills	4

5 letter words with SILLIER	Points
slier	5
rills	5
rille	5
riles	5
riels	5
lisle	5
liers	5
iller	5

6 letter words with SILLIER	Points
siller	6
lilies	6
rilles	6

7 letter words with SILLIER	Points
sillier	7

Found 52 words in 0.27719 seconds