authorisation vs authority

authorisation and authority both are nouns.

Word	Noun	Adjective	Verb	Adverb
authorisation	Yes	No	No	No
authority	Yes	No	No	No

As nouns, authorisation and authority are synonyms defined as:

authorisation and authority: the power or right to give orders or make decisions

Other synonyms of authorisation include authorization, dominance, potency, say-so.

As nouns, authorisation and authority are synonyms defined as:

Other synonyms of authorisation include authorization, sanction.

authorisation (noun)	authority (noun)
the act of conferring legality or sanction or formal warrant	the power or right to give orders or make decisions
the power or right to give orders or make decisions	official permission or approval
official permission or approval	freedom from doubt; belief in yourself and your abilities
a document giving an official instruction or command	an authoritative written work
	an administrative unit of government
	an expert whose views are taken as definitive
	(usually plural) persons who exercise (administrative) control over others