How do grandiose and delusions of grandeur in mental health terms. differ?

Neurotic/psychotic: "grandiosity" refers to any sense of greatness. It exists on a continuum from healthy grandiosity in growing children through a sense of expansiveness to narcissistic defensiveness. "delusions of grandeur, " like all delusions, are psychotic in the sense that they are defenses against terrors of fragmentation, self-destruction, and other forms of personal annihilation.