alliance

nouns

the state of being allied or confederated
alliance, confederation
a connection based on kinship or marriage or common interest
"the shifting alliances within a large family"; "their friendship constitutes a powerful bond between them"
alliance, bond
an organization of people (or countries) involved in a pact or treaty
alignment, alinement, alliance, coalition
a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim
alliance
is a type of (narrower)
a written agreement between two states or sovereigns
accord, pact, treaty
the act of forming an alliance or confederation
alliance, confederation
is derived from
ally