add a different result to a IF/OR formula

Hi, my formula works right now as it is. However, I want to be able to also type NA on cell CF8 and also give me a warning. Right now it just defaults to #value because it expects a number. What can I do?
=IF(OR(AND(CE8>CF8-2.5,CE8<CF8+2.5),CF8=""),"PASS","WARNING")

Administrative Note:

We would very much like to help you with your query, however the thread title does not really convey what your request is about, and almost everybody here has some issue or other with formulae.

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Try

Formula:

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