cosmographer vs cosmographist

cosmographer and cosmographist both are nouns.

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

As nouns, cosmographer and cosmographist are synonyms defined as:

cosmographer and cosmographist: a scientist knowledgeable about cosmography

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