"to be" or "not to be"

I don't recall whether I posted this inquiry before or not. If I did
please advise me so, otherwise, here goes:

I've been working for quite some time on another conlang, strictly a
priori. I have actually just dedicated a notebook to it and as often as
I think of something that I want in it, I write it in the notebook. This
has been quite a different approach for me and frankly much more
favourable in the light of creativity. (I'm wandering off the path
already)

Anyway. I was looking in my Roget's Thesaurus and in the front, Roget
has the Tabular Synopsis of Categories.  This seems like a good
compendium of root meaning that I could work from as a basis for some
roots for my new lang. Under existence, there is an entry for
"Inexistence." Roget has a pile of words that related to this, but it
got me thinking. Is there a language that has a specific word for non
existence eg. "not to be"? I find it fascinating to think in those terms
and would like to see how it might have worked elsewhere.

TY in advance,
Scotto

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