realm(A set of security principles, in a non-Windows networked environment, that are subject to Kerberos authentication); intellectual genre(A classification that describes the nature of content, e.g. sermon, interview, etc., rather than the content itself)
domain(In the Internet and other networks, the highest subdivision of a domain name in a network address, which identifies the type of entity owning the address (for example, .com for commercial users or .edu for educational institutions) or the geographical location of the address (for example, .fr for France or .sg for Singapore). The domain is the last part of the address (for example, www.acm.org))
