Yes, cruxes is a Scrabble word!
...and is worth 15 points in Scrabble, and 17 points in Words with Friends
cruxes
Noun
1. A small conspicuous constellation in the southern hemisphere in the Milky Way near Centaurus
2. The most important point
What Scrabble words can I make with the letters in cruxes?
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Words that can be created with an extra letter added to cruxes:
E:excuser