Yes, seisor is in the scrabble dictionary

...and is worth 6 points by itself.

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Seisor Definition

noun

Variant of seizor.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

osiers

6

2 letter words with SEISOR

Points

oi

2

re

2

er

2

os

2

or

2

oe

2

is

2

si

2

so

2

es

2

3 letter words with SEISOR

Points

sir

3

sis

3

ser

3

sos

3

sri

3

sei

3

roe

3

res

3

rei

3

ose

3

ors

3

ore

3

oes

3

ire

3

ess

3

ers

3

4 letter words with SEISOR

Points

sers

4

sire

4

sirs

4

sore

4

seis

4

sori

4

sris

4

reis

4

rose

4

roes

4

rise

4

oses

4

ores

4

ires

4

eros

4

5 letter words with SEISOR

Points

roses

5

rises

5

osier

5

sires

5

sores

5

6 letter words with SEISOR

Points

osiers

6

seisor

6

Found 48 words in 0.16632 seconds