Yes, siller is in the scrabble dictionary

...and is worth 8 points by itself.

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Siller Definition

noun

Silver.

from the GNU version of the Collaborative International Dictionary of English

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Here are some other words you could make with the letters SILLER, you can also
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Top Words by points	Points
rilles	6

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

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

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

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

6 letter words with SILLER	Points
rilles	6
siller	6

Found 48 words in 0.18577 seconds