Neology

[Raeanne Dimick]

The introduction of a new word, or of words or
significations, into a language; as, the present nomenclature of
chemistry is a remarkable instance of neology.

[Britney]

It is a noun with [at last] four meanings:
1 The study or art of creating [new words].
2 The act of introducing a new word into a language.
3 The use of an existing word in a new way.
4 The holding of novel or rational religious views. (Although this definition is now largely [obsolete].)

[Dave Paprocki]

([noun]) [The field] of [study] about new things.

[Dave Paprocki]

The coining or use of new words or phrases; = neologism.

[soniportgo]

a newly invented word or phrase