Yes, pish is in the scrabble dictionary

...and is worth 9 points by itself.

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Pish Definition

interjection

Used to express disdain.

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

Used to express annoyance, impatience, or disgust.

from Free Scrabble Dictionary

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Top Words by points	Points
hips	9

2 letter words with PISH	Points
hi	5
is	2
pi	4
sh	5
si	2

3 letter words with PISH	Points
hip	8
his	6
phi	8
pis	5
psi	5
sip	5

4 letter words with PISH	Points
hips	9
phis	9
pish	9
ship	9

Found 15 words in 0.1474 seconds