Question: what is the noun of "exist"? 

Answer: Existence.\n\n\nMain Entry: ex·is·tence\nPronunciation: ig-'zis-t&n(t)s\nFunction: noun\n\n1 a obsolete : reality as opposed to appearance \nb : reality as presented in experience \nc (1) : the totality of existent things (2) : a particular being <all the fair existences of heaven -- John Keats> \nd : sentient or living being : LIFE\n\n2 a : the state or fact of having being especially independently of human consciousness and as contrasted with nonexistence \nb : the manner of being that is common to every mode of being \nc : being with respect to a limiting condition or under a particular aspect\n\n3 : continued or repeated manifestation
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