Yes, sansei is in the scrabble dictionary

...and is worth 7 points by itself.

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Sansei Definition

noun

A US-born grandchild of a Japanese immigrant to America.
from the English-language Wiktionary
A son or daughter of nisei parents who is born and educated in America and especially in the United States.
from Free Scrabble Dictionary

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Top Words by points

Points

anises

6

2 letter words with SANSEI

Points

si

2

is

2

in

2

na

2

es

2

en

2

ne

2

ae

2

as

2

an

2

ai

2

3 letter words with SANSEI

Points

san

3

sae

3

sis

3

sea

3

nae

3

sei

3

sen

3

sin

3

ins

3

ess

3

ens

3

ass

3

ani

3

ane

3

ais

3

ain

3

4 letter words with SANSEI

Points

sans

4

seas

4

seis

4

sane

4

sine

4

sins

4

naes

4

sain

4

ness

4

anis

4

anes

4

ains

4

5 letter words with SANSEI

Points

anise

5

sains

5

sanes

5

sasin

5

sensa

5

sines

5

6 letter words with SANSEI

Points

anises

6

sanies

6

sansei

6

Found 48 words in 0.20104 seconds