Document center
A document library template which is configured to contain a large quantity of documents with each document uploaded to the center assigned a unique identifier number.
Document library
A list where documents and folders are stored. The document library has customized settings above and beyond a folder such as advanced settings, versioning settings, workflow settings, and information policies.
Document set
Allow for a collection of related documents, and have them displayed as one unit. Example, one may have a collection of project management template documents which would include - a requirements document, a project plan and a status report document, etc. These would be stored as the Project Management Templates document set.
Document workspace
Document repository which lets users collaborate on one or more documents.
Document workspace site
SharePoint site which is based on a document workspace site template. It is used for planning and posting about a document or a set of related documents.