neologist
/ˌniːɒˈlɒdʒɪst/Definitions
1. noun
A person who specializes in the formation of new words or the study of new words in a language.
“As a neologist, she created many new words to describe the rapidly changing technology landscape.”
2. noun
A specialist in the study of new words, especially in a particular language or field.
“The neologist was invited to give a lecture on the evolution of slang terms in modern English.”