Yes, apo is in the scrabble dictionary

...and is worth 6 points by itself.

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Apo Definition

adjective

In an inactive, unbound state.
from the English-language Wiktionary

abbreviation

Army post office.
from Free Scrabble Dictionary

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Top Words by points

Points

apo

5

2 letter words with APO

Points

op

4

pa

4

po

4

3 letter words with APO

Points

apo

5

opa

5

Found 5 words in 0.12317 seconds