neologist

n. [ Cf. F. néologiste. ] 1. One who introduces new words or new senses of old words into a language.
Syn. -- verbarian. [ 1913 Webster ]

2. An innovator in any doctrine or system of belief, especially in theology; one who introduces or holds doctrines subversive of supernatural or revealed religion; a rationalist, so-called. [ 1913 Webster ]