photograph vs photo

photograph and photo both are nouns.

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

As nouns, photograph and photo are synonyms defined as:

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

Other synonyms of photograph include exposure, pic, picture.

photograph (noun)	photo (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

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