Yes, tabu is in the scrabble dictionary

...and is worth 8 points by itself.

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Tabu Definition

noun

Variant of taboo.

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

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Top Words by points	Points
abut	6

2 letter words with TABU	Points
ab	4
at	2
ba	4
ta	2
ut	2

3 letter words with TABU	Points
bat	5
but	5
tab	5
tau	3
tub	5
uta	3

4 letter words with TABU	Points
abut	6
tabu	6
tuba	6

Found 14 words in 0.11169 seconds