montage vs ikon

montage and ikon both are nouns.

Word	Noun	Adjective	Verb	Adverb
montage	Yes	No	No	No
ikon	Yes	No	No	No

As nouns, ikon is a hypernym of montage; that is, ikon is a word with a broader meaning than montage:

montage: a paste-up made by sticking together pieces of paper or photographs to form an artistic image
ikon: a visual representation (of an object or scene or person or abstraction) produced on a surface

Other hypernyms of montage include paste-up, icon, image, picture.

montage (noun)	ikon (noun)
a paste-up made by sticking together pieces of paper or photographs to form an artistic image	a visual representation (of an object or scene or person or abstraction) produced on a surface
	a conventional religious painting in oil on a small wooden panel; venerated in the Eastern Church