"Album"

Before LP: This was mostly packaging and storage. Store bought albums were "box sets" of singles. There might be a theme or concept or just a compilation. Generic, after market 78rpm albums were the equivalent of photo, cassette & CD storage cases and binders. They both still turn up at thrift shops & boot sales.

After LP: In common usage album is pretty much interchangeable with LP, ie: not a single. fwiw: I've never heard a 2x7" release referred to as an album.