Yes, seise is in the scrabble dictionary

...and is worth 5 points by itself.

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Seise Definition

verb

Variant of seize.

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

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Top Words by points	Points
seise	5

2 letter words with SEISE	Points
es	2
is	2
si	2

3 letter words with SEISE	Points
ess	3
see	3
sei	3
sis	3

4 letter words with SEISE	Points
eses	4
esse	4
sees	4
seis	4

5 letter words with SEISE	Points
seise	5

Found 12 words in 0.14671 seconds