Formal:
* Photomontage: This term refers to a composite image created by combining multiple photographs.
* Photocollage: Similar to photomontage, this term emphasizes the use of various pictures cut out and pasted together.
* Album: This refers to a collection of photographs, often bound together in a book.
* Portfolio: This term is used for a collection of photographs, often showcasing an artist's work.
Informal:
* Collection: This is a general term for any group of things, including photographs.
* Gallery: While usually referring to a space for displaying art, it can also refer to a collection of images.
* Montage: This is a broader term that can refer to any combination of images, sounds, or other elements.
* Grid: This refers to a layout of pictures arranged in rows and columns.
The best word will depend on the specific context and the type of images being combined.