Neologist

[Dave Paprocki]

One who introduces new words or new senses of old words
into a language.

[Julene]

Actually a [neologism], a neologist is one to creates neologisms. [Technically], since the term neologist is a neologism it self-perpetuates simply by existing- or not, [technically].
A neologist is one who makes up words

[Raeanne Dimick]

An individual inclined to making up [new words]. Based on the noun Neoligism: The [introduction] or use of new words or new [senses] of existing words.

[Urooj.Zafar]

a lexicographer of new words and expressions