history vs historian

history and historian both are nouns.

Word	Noun	Adjective	Verb	Adverb
history	Yes	No	No	No
historian	Yes	No	No	No

history (noun)	historian (noun)
the discipline that records and interprets past events involving human beings	a person who is an authority on history and who studies it and writes about it
all that is remembered of the past as preserved in writing; a body of knowledge
a record or narrative description of past events
the aggregate of past events
the continuum of events occurring in succession leading from the past to the present and even into the future