photomosaic vs pic

photomosaic and pic both are nouns.

Word	Noun	Adjective	Verb	Adverb
photomosaic	Yes	No	No	No
pic	Yes	No	No	No

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

photomosaic: arrangement of aerial photographs forming a composite picture
pic: a representation of a person or scene in the form of a print or transparent slide or in digital format

Other hypernyms of photomosaic include exposure, photo, photograph, picture.

photomosaic (noun)	pic (noun)
arrangement of aerial photographs forming a composite picture	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