These are other terms that we find within The Sources.
(priest – a Latinised Celtic word, literally “reverer of the gods”) used by Diogenes Laertius
(bard- a poet/composer – a Latinised Celtic word) used by Ammianus, Diodorus, and Strabo,
(poetic prophet/diviner – Latinised Celtic, cognate with the Old-Irish Fáith – Modern-Irish fili – the Welsh Gwawd and the English Ovate) used by Strabo,
Seer (prophet/diviner) used by Diodorus,
(unknown – possibly a philosopher, teacher) used by Ammianus,
(seems to be a synonym of Druids – Latinised Celtic, possibly compounded from sêr, ‘stars’ and honydd, ‘one who discriminates or points out’ and is probably related to the Old-Welsh Seronyddion, ‘astronomer’) used by Diodorus.Gutuatri
(masters, or priests, of particular sancturies – Latinised Celtic, from gutu ‘voice’, perhaps meaning ‘speakers or voice of the gods’) known from a few inscriptions and from Aulus Hirtius’ addition to Commentarii de Bello Gallico which mentions a gutuatros put to death by Caesar.
Druidism = a set of beliefs particular to Druids
Druidry = a set of practices particular of Druids
Druidology = the study of the above
Druidic = Of or relating to the druids