wedding picture vs photograph

wedding picture and photograph both are nouns.

Word	Noun	Adjective	Verb	Adverb
wedding picture	Yes	No	No	No
photograph	Yes	No	Yes	No

As nouns, photograph is a hypernym of wedding picture; that is, photograph is a word with a broader meaning than wedding picture:

wedding picture: photographs of bride and groom and their friends taken at their wedding
photograph: a representation of a person or scene in the form of a print or transparent slide or in digital format

Other hypernyms of wedding picture include exposure, photo, pic, picture.

wedding picture (noun)	photograph (noun)
photographs of bride and groom and their friends taken at their wedding	a representation of a person or scene in the form of a print or transparent slide or in digital format

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