Yes, ossia is in the scrabble dictionary

...and is worth 5 points by itself.

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Ossia Definition

conjunction

Music Or else. Used as a direction to the performer to designate an alternate section or passage.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

oasis

5

2 letter words with OSSIA

Points

ai

2

as

2

is

2

oi

2

os

2

si

2

so

2

3 letter words with OSSIA

Points

ais

3

ass

3

sis

3

sos

3

4 letter words with OSSIA

Points

ossa

4

5 letter words with OSSIA

Points

oasis

5

ossia

5

Found 14 words in 0.13329 seconds