biography vs life story

biography and life story both are nouns.

Word	Noun	Adjective	Verb	Adverb
biography	Yes	No	No	No
life story	Yes	No	No	No

As nouns, biography and life story are synonyms defined as:

biography and life story: an account of the series of events making up a person's life

Other synonyms of biography include life, life history.

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