TYPIKA – Prayers, and hymmns from the Divine Liturgy chanted on days when the Divine Liturgy is not celebrated. In the absence of a priest, a deacon,or layman may lead the service of the Typika.

TYPIKON – The Book of direction or rubrics that explains how to celebrate the services. There are two major versions in use in the Orthodox Church and several minor adaptations, the Greek Typikon and the Slavonic Typikon.

HOURS – Short services – read at the First Hour (6:00 AM), Third Hour (9:00 AM), Sixth Hour (Noon) and the Ninth Hour (3:00 PM). The Hours are often combined to form the Royal Hours on the eves of major Feasts.

Prayer To The Holy Spirit – O Heavenly King, O Comforter, Spirit of Truth, Who art everywhere present and fillest all things, Treasury of good things and Giver of life: Come and dwell in us, and cleanse us of all impurities, and save our souls, O Good One.

TRISAGION – (Greek – Thrice Holy) A hymn “Holy God, Holy Mighty, Holy Immortal, have mercy on us,” sung during services and said during private prayer.

TROPARION – A short hymn.

THEOTOKION – A troparion in honor of the Theotokos. The final troparion of a set of stichera is usually a Theotokion.

KONTAKION – A troparion that summarizes the historical meaning of a feast. Originally a kontakion consisted of several verses. Today only the major troparion of a kontakion is still sung, with the sole exception of the Akathist Hymn, which is still sung in its entirety. The author of most kontakia was St. Romanos the Melodos, d.518.

Prokeimenon – A liturgical verse or scriptural passage sung or read before the apostolic reading.

Epistle – A writing directed or sent to a person or group of persons, usually a letter and a very formal, often didactic and elegant one. The letters from Apostles to Christians in the New Testament are often referred to as epistles.

Gospel – (in Greek, is evangelion which, means the “glad tidings” or the “good news”) is the message of Christ. In the Greco-Roman world, from the time of Alexander the Great and on into the Roman Empire, this word was used to refer to history-making, world-shaping reports of political, military, or societal victories.

https://www.fatheralexander.org/booklets/english/hours_typica.htm
http://www.saintjonah.org/services/horologion.htm
https://www.holycrossyakima.org/orthodoxPdfs/Orthodox%20Glossary.pdf