Yes, wax is a Scrabble word!
...and is worth 13 points in Scrabble, and 13 points in Words with Friends
wax
Verb
1. Cover with wax
2. Go up or advance
3. Increase in phase
Noun
1. Any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water
What Scrabble words can I make with the letters in wax?
2 Letter Words
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Words that can be created with an extra letter added to wax:
Y:waxy