The difference between Justicer and Justiciary

Justicer as a noun (archaic):

One who administers justice, particularly a judge.

Justiciary as a noun (Scotland, countable, chiefly, _, historical):

A judgeship: a judge's jurisdiction, power, or office.

Justiciary as a noun (Originally, _, Scotland, uncountable):

The judiciary: a collective term for the court system or the body of judges, justices etc.

Justiciary as a noun (historical):

One who administers justice, particularly: A judge or justice. A magistrate. A Chief Justiciar: the highest political and judicial officer of the Kingdom of England in the 12th and 13th centuries. A justiciar: a high-ranking judicial officer of medieval England or Scotland. Various equivalent medieval offices elsewhere in Europe.

Justiciary as a noun (Christian, theology):

A believer in the doctrine (or heresy) that adherence to religious law redeems mankind before God.

Justiciary as an adjective (Christian, theology, obsolete):

Of or relating to justification or redemption before God.

Justiciary as an adjective (Christian, theology, obsolete):

Of or relating to the doctrine (or heresy) that adherence to religious law redeems mankind before God.

Justiciary as an adjective:

Judicial: of or relating to the administration of justice, judges, or judgeships.

Justiciary as an adjective:

Of or relating to the High Court of Justiciary.

Justiciary as an adjective:

Of or relating to a circuit court held by one of the judges of the High Court of Justiciary.