stock image vs stock photograph

stock image and stock photograph both are nouns.

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

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

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

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