autobiography vs biography

autobiography and biography both are nouns.

Word	Noun	Adjective	Verb	Adverb
autobiography	Yes	No	No	No
biography	Yes	No	No	No

As nouns, biography is a hypernym of autobiography; that is, biography is a word with a broader meaning than autobiography:

Other hypernyms of autobiography include life, life history, life story.

autobiography (noun)	biography (noun)
a biography of yourself	an account of the series of events making up a person's life