cosmographist vs cosmographer

cosmographist and cosmographer both are nouns.

Word	Noun	Adjective	Verb	Adverb
cosmographist	Yes	No	No	No
cosmographer	Yes	No	No	No

As nouns, cosmographist and cosmographer are synonyms defined as:

cosmographist and cosmographer: a scientist knowledgeable about cosmography

cosmographist (noun)	cosmographer (noun)
a scientist knowledgeable about cosmography	a scientist knowledgeable about cosmography