Yes, reflex is a Scrabble word!
...and is worth 16 points in Scrabble, and 17 points in Words with Friends
reflex
Adjective
1. Without volition or conscious control
Noun
1. An automatic instinctive unlearned reaction to a stimulus
What Scrabble words can I make with the letters in reflex?
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Words that can be created with an extra letter added to reflex:
U:flexure