life history vs biography

life history and biography both are nouns.

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

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

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

Other synonyms of life history include life, life story.

life history (noun)	biography (noun)
the general progression of your working or professional life	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