collage vs montage

collage and montage both are nouns.

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

As nouns, collage and montage are synonyms defined as:

collage and montage: a paste-up made by sticking together pieces of paper or photographs to form an artistic image

collage (noun)	montage (noun)
a paste-up made by sticking together pieces of paper or photographs to form an artistic image	a paste-up made by sticking together pieces of paper or photographs to form an artistic image
any collection of diverse things