celestial hierarchy - the collective body of angels

data hierarchy - an arrangement of data consisting of sets and subsets such that every subset of a set is of lower rank than the set

taxonomy - a classification of organisms into groups based on similarities of structure or origin etc

system, scheme - a group of independent but interrelated elements comprising a unified whole; "a vast system of production and distribution and consumption keep the country going"

series - similar things placed in order or happening one after another; "they were investigating a series of bank robberies"

organization, organisation - a group of people who work together

governance, governing body, organisation, administration, brass, establishment, organization - the persons (or committees or departments etc.) who make up a body for the purpose of administering something; "he claims that the present administration is corrupt"; "the governance of an association is responsible to its members"; "he quickly became recognized as a member of the establishment"