Yes, possum is in the scrabble dictionary

...and is worth 13 points by itself.

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Possum Definition

noun

Chiefly Southern U.S. An opossum.

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

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Top Words by points	Points
possum	10

2 letter words with POSSUM	Points
om	4
so	2
mo	4
po	4
os	2
op	4
um	4
up	4
us	2
mu	4

3 letter words with POSSUM	Points
sus	3
sop	5
ump	7
ums	5
sup	5
sum	5
sou	3
upo	5
sos	3
ups	5
som	5
mop	7
pus	5
pos	5
pom	7
mos	5
ops	5
oms	5
mus	5

4 letter words with POSSUM	Points
sumo	6
umps	8
mops	8
moss	6
muso	6
muss	6
sups	6
sums	6
sump	8
puss	6
sous	4
soup	6
sops	6
soms	6
opus	6
poms	8

5 letter words with POSSUM	Points
soups	7
sumos	7
sumps	9
musos	7

6 letter words with POSSUM	Points
possum	10

Found 50 words in 0.16755 seconds