An umbrella term is a word that provides a superset

Subset

In mathematics, especially in set theory, a set A is a subset of a set B if A is "contained" inside B. A and B may coincide. The relationship of one set being a subset of another is called inclusion or sometimes containment...

 or grouping of concept

Concept

The word concept is used in ordinary language as well as in almost all academic disciplines. Particularly in philosophy, psychology and cognitive sciences the term is much used and much discussed. WordNet defines concept: "conception, construct ". However, the meaning of the term concept is much...

s that all fall under a single common category. Umbrella term is also called a hypernym

Hypernym

In linguistics, a hyponym is a word or phrase whose semantic field is included within that of another word, its hypernym . In simpler terms, a hyponym shares a type-of relationship with its hypernym...

. For example, cryptology is an umbrella term that encompasses cryptography

Cryptography

Cryptography is the practice and study of techniques for secure communication in the presence of third parties...

 and cryptanalysis

Cryptanalysis

Cryptanalysis is the study of methods for obtaining the meaning of encrypted information, without access to the secret information that is normally required to do so. Typically, this involves knowing how the system works and finding a secret key...

, among other fields. Similarly, an umbrella organization

Umbrella organization

An umbrella organization is an association of institutions, who work together formally to coordinate activities or pool resources. In business, political, or other environments, one group, the umbrella organization, provides resources and often an identity to the smaller organizations...

 is a central and coordinating body representing a number of smaller, separate bodies.

The closely related blanket term is a word

Morpheme

In linguistics, a morpheme is the smallest semantically meaningful unit in a language. The field of study dedicated to morphemes is called morphology. A morpheme is not identical to a word, and the principal difference between the two is that a morpheme may or may not stand alone, whereas a word,...

 or phrase

Phrase

In everyday speech, a phrase may refer to any group of words. In linguistics, a phrase is a group of words which form a constituent and so function as a single unit in the syntax of a sentence. A phrase is lower on the grammatical hierarchy than a clause....

 that is used to describe multiple groups of related things.