Yes, apexes is a Scrabble word!
...and is worth 15 points in Scrabble, and 16 points in Words with Friends
apexes
Noun
1. The highest point (of something)
2. The point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
What Scrabble words can I make with the letters in apexes?
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Words that can be created with an extra letter added to apexes:
N:expanse