* Lexicographers are primarily concerned with documenting existing language, not creating it. They define words, track their usage, and analyze their evolution.
* Neologism Creators is a more accurate descriptor, although it doesn't necessarily imply they are lexicographers.
* Wordsmiths is a more general term for someone skilled with language, but it encompasses more than just coiners of new words.
* Inventors is a broad term, but it could apply to someone who invents new words.
* Linguistic Innovators emphasizes the creative aspect of their work.
Ultimately, there isn't one perfect term. You could even use a more descriptive phrase like "someone who creates new words and expressions."
It's worth noting that while some individuals may focus on coining new terms, it's often a collaborative process. New words and phrases often emerge organically from everyday usage, and they gain legitimacy through widespread adoption.