talking picture vs pic

talking picture and pic both are nouns.

Word	Noun	Adjective	Verb	Adverb
talking picture	Yes	No	No	No
pic	Yes	No	No	No

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

talking picture: a movie with synchronized speech and singing
pic: a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement

talking picture (noun)	pic (noun)
a movie with synchronized speech and singing	a representation of a person or scene in the form of a print or transparent slide or in digital format
	a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement