Neologism is

(B) Totally a new word # Neologisms are newly formed words or phrases whose derivation can not be understood.> These are created to express a concept for which the subject has no dictionary word.> Sometimes, normal words are used in an unconventional or distorted way but the derivation can be understood, even if bizarre.> These are called word approximations or paraphrasias] e.g. describing stomach as a 'food vessel'.