Aresearch methods toolis a web-based search instrument used to explore [research] methods concepts to help design research projects, understand particular methods or identify a new method, conduct research, and write up findings.
A subject database is a large, regularly updated, searchable collection of content (bibliographic records, abstracts, full-text documents, directory entries, images, statistics, etc.) related to a specific subject or field. [Definition from the Online Dictionary for Library and Information Science]