Yes, apsis is a Scrabble word!
...and is worth 7 points in Scrabble, and 8 points in Words with Friends
apsis
Noun
1. A domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
What Scrabble words can I make with the letters in apsis?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words