chronicler vs historiographer

chronicler and historiographer both are nouns.

As nouns, historiographer is a hypernym of chronicler; that is, historiographer is a word with a broader meaning than chronicler:

chronicler: someone who writes chronicles
historiographer: a person who is an authority on history and who studies it and writes about it

Other hypernyms of chronicler include historian.

chronicler (noun)	historiographer (noun)
someone who writes chronicles	a person who is an authority on history and who studies it and writes about it