photo vs photograph

photo and photograph both are nouns.

Word	Noun	Adjective	Verb	Adverb
photo	Yes	No	No	No
photograph	Yes	No	Yes	No

As nouns, photo and photograph are synonyms defined as:

photo and photograph: a representation of a person or scene in the form of a print or transparent slide or in digital format

Other synonyms of photo include exposure, pic, picture.

photo (noun)	photograph (noun)
a representation of a person or scene in the form of a print or transparent slide or in digital format	a representation of a person or scene in the form of a print or transparent slide or in digital format

photo (verb)	photograph (verb)
	record on photographic film
	undergo being photographed in a certain way