Nail-biting is the usual spelling, whether the word is used as a noun ( the incredible nail-biting ) or an adjective ( the nail-biting last seconds ).
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AmericanwithgrammarquestionsCool. Meaning the 19 search results for "nail-biting" trumps the 3 for "nailbiting" and therefore you have your answer?Yep. I checked OneLook before I posted. Very useful site.