photomontage

As a noun photomontage

is (photography) a composite image combining two or more photographs.

As a letter x is

the twenty-fourth letter of the.

As a symbol x is

voiceless velar fricative.

As a noun photomontage

is (photography) a composite image combining two or more photographs.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between photomontage and photocollage

is that photomontage is (photography) a composite image combining two or more photographs while photocollage is a form of collage made by assembling photographs.

As nouns the difference between photomontage and collage

is that photomontage is a composite combining two or more photographs while collage is a picture made by sticking other pictures onto a surface.

As a verb collage is

to make into a collage.

As nouns the difference between montage and photomontage

is that montage is an art form consisting of putting together or assembling various smaller pictures to create a larger work while photomontage is a composite combining two or more photographs.

As a verb montage

is to combine or depict into a montage.