stock photograph vs stock image

stock photograph and stock image both are nouns.

Word	Noun	Adjective	Verb	Adverb
stock photograph	Yes	No	No	No
stock image	Yes	No	No	No

As nouns, stock photograph and stock image are synonyms defined as:

stock photograph and stock image: an existing photograph licensed for a specific use

stock photograph (noun)	stock image (noun)
an existing photograph licensed for a specific use	an existing photograph licensed for a specific use