photomosaic vs photo

photomosaic and photo both are nouns.

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

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

photomosaic: arrangement of aerial photographs forming a composite picture
photo: 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, photograph, pic, picture.

photomosaic (noun)	photo (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