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"Narrativa" is a form of "narrativa", a noun which is often translated as "fiction". "Narrador" is a noun which is often translated as "narrator". Learn more about the difference between "narrativa" and "narrador" below.
la narrativa()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (literature)
a. fiction
La narrativa de Cervantes se estudia en todos los cursos de literatura española.Cervantes' fiction is studied in every Spanish literature course.
el narrador, la narradora()
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).