What is another word for a group of pictures?

If you are talking about a group of pictures, you have several options. A collection is a general word for any group of photos gathered together. A set often means a specific series, like all the photos from one part of the day. A gallery is commonly used online, where you display many images on a page for guests to view or download.

For a wedding, you might hear the photographer talk about your final gallery, meaning all the edited photos delivered to you. If you choose a selection of favourites, that could be called a highlight set or a curated edit. An album is the physical or digital book you create afterwards, with the pictures arranged in a story.

In more artistic contexts, a portfolio is a group of pictures chosen to show a photographer's style, but that is not usually what you call your wedding photos. For your own use, keep it simple: say gallery, collection, or set, and people will know what you mean.