Found this nice source today:
GLOSSARY OF MAGIC IN ANCIENT GREEK LANGUAGE(HellenicGods.org)
A
Æpohdí - (epode; Gr. ἐπῳδή, ΕΠΩΙΔΗ. Noun.) – spell or sung enchantment.
Ará – (Gr. ἀρά, ΑΡΑ. Noun.) a curse, sometimes a vow or a prayer.
Asævís – (asebes; Gr. ἀσεβής, ΑΣΕΒΗΣ. Adjective.) impious, sacrilegious, blasphemous.
Asǽveia - (asebeia; Gr. ἀσέβεια, ΑΣΕΒΕΙΑ. Noun.) impiety, blasphemy.
Astroloyía – (astrologia; Gr. ἀστρολογία, ΑΣΤΡΟΛΟΓΙΑ. Noun.) – originally astronomy (ἀστρονομία) but the word came to refer to astrology, divination by observation of the heavenly bodies in conjunction with the zodiac.
Astrológos – (Gr. ἀστρολόγος, ΑΣΤΡΟΛΟΓΟΣ. Noun.) – originally astronomer but the word came to mean astrologer.
G
Góïs – (goës; Gr. γόης, ΓΟΗΣ. Noun. Etym. γοάω, “to groan.”) – magician, sorcerer, one who howls out enchantments, juggler, cheat.
Goïteia – (goeteia; Gr. γοητεία, ΓΟΗΤΕΙΑ. Noun.) – witchcraft, deception, to cheat.
I
Iohnistikí – (oionistice; Gr. οἰωνιστική, ΟΙΩΝΙΣΤΙΚΗ. Participle of adj.) divination from the flight of birds, augury.
Iohnós – (oionos; Gr. οἰωνός, ΟΙΩΝΟΣ. Noun.) – an omen derived from a bird of augury.
Ipatoskopía - (epatoscopia; Gr. ἡπατοσκοπία, ΗΠΑΤΟΣΚΟΠΙΑ. Noun.) inspection of the liver of a sacrificial animal for the purpose of divination, hepatoscopy, haruspicy, hepatomancy.
K
Katádæsis – (catadesis; Gr. κατάδεσις, ΚΑΤΑΔΕΣΙΣ. Noun.) – binding by spells.
Katádæsmos – (catadesmus; Gr. κατάδεσμος, ΚΑΤΑΔΕΣΜΟΣ. Noun.) a curse tablet designed to bind its victim by a spell.
Katádoh – (catado; Gr. κατᾴδω, ΚΑΤΑΙΔΩ. Verb.) – sing a spell or incantation.
Khymeia - (chymeia; Gr. χυμεία, ΧΥΜΕΙΑ. Noun. Also χημεία, χημία) – alchemy.
Kílima – (celema; Gr. κήλημα, ΚΗΛΗΜΑ. Noun.) – spell or charm.
M
Mágos – (magus; Gr. μάγος, ΜΑΓΟΣ. Noun.) – wizard, impostor. The word originally meaning a Magian, one of the Median tribe, or one of the priests of Persia.
Mandeia – (manteia; Gr. μαντεία, ΜΑΝΤΕΙΑ. Noun.) – divination.
Mandosýni – (mantosyne; Gr. μαντοσύνη, ΜΑΝΤΟΣΥΝΗ. Noun.) – divination.
Manganévoh – (manganeuo; Gr. μαγγανεύω, ΜΑΓΓΑΝΕΥΩ. Verb.) – using magic charms.
Mayeia – (mageia; Gr. μαγεία, ΜΑΓΕΙΑ. Noun.) – magic, originally, the theology of the Magians.
Mayévmata – (mageumata; Gr. μαγεύματα, ΜΑΓΕΥΜΑΤΑ. Noun. Plural of μάγευμα.) witchcraft, the use of spells and charms.
O
Occult – knowledge of the hidden, of the paranormal.
Órnis – (Gr. ὄρνις, ΟΡΝΙΣ. Noun.) – bird of augury, omen derived from their calls or flight.
P
Pæríamma – (periamma; Gr. περίαμμα, ΠΕΡΙΑΜΜΑ. Noun.) a charm, an amulet.
Pharmakéfs – (pharmaceus; Gr. φαρμακεύς, ΦΑΡΜΑΚΕΥΣ. Noun.) – poisoner, sorcerer.
Pharmakeia – (pharmaceia; Gr. φαρμακεῖα, ΦΑΡΜΑΚΕΙΑ. Noun.) witchcraft, use of spells and drugs, poisoning.
Pharmakís – (pharmacis; Gr. φαρμακίς, ΦΑΡΜΑΚΙΣ. Noun.) witch, sorceress.
Pházma – (Gr. φάσμα, ΦΑΣΜΑ. Noun.) – portent, omen.
Phíltron – (Gr. φίλτρον, ΦΙΛΤΡΟΝ. Noun.) love-charm or love-potion.
Phími – (pheme; Gr. φήμη, ΦΗΜΗ. Noun.) – omen, prophetic utterance.
Psykhagoyein – (psychagogein; Gr. ψυχαγωγεῖν, ΨΥΧΑΓΩΓΕΙΝ) conjure the dead by means of rituals and offerings, necromancy.
Pyromandeia – (pyromanteia; Gr. πυρομαντεία, ΠΥΡΟΜΑΝΤΕΙΑ. Noun.) divination by fire, pyromancy.
Ravdomandeia – (rabdomanteia; Gr. ῥαβδομαντεία, ΡΑΒΔΟΜΑΝΤΕΙΑ. Noun.) divination by means of a rod or wand, rhabdomancy.
S
Sýmvolos – (symbolus; Gr. σύμβολος, ΣΥΜΒΟΛΟΣ. Noun.) – omen.
V
Vælomándeia – (belomanteia; Gr. βελομάντεια, ΒΕΛΟΜΑΝΤΕΙΑ. Noun.) divination by means of arrows, belomancy.
Y
Ydromandeia – (hydromanteia; Gr. ὑδρομαντεία, ΥΔΡΟΜΑΝΤΕΙΑ. Noun.) divination by water, hydromancy.
Yæohmandeia – (geomanteia; Gr. φεωμαντεία, ΓΕΩΜΑΝΤΕΙΑ. Noun.) divination by earth, geomancy.
Edit: Man, this site is amazing! I can't stop reading. While theoi.com is great for mythology references, this one goes deeper in the religious part.
Just found this explanation of the myth about Heracles and the Hydra:
The ego is represented in mythology by the Lærnaian Ýdra (Lernaean Hydra; Gr. Λερναία Ὕδρα), the serpentine beast which Iraklís (Heracles or Hercules; Gr. Ἡρακλῆς) slew as the second of his mighty Labors. The ýdra is a snake with many heads; when one head is destroyed, two grow in its place. The ýdra is symbolic of the endless deceptions of ego which continuously distort the perspective of one's relationship to the phenomenal world. The ego deceives us into thinking that selfishness is the only intelligent way to conduct one's life. This is why the ego is compared to the ýdra, because the ýdra is very clever; we think of the ego as our servant, but in reality, we are its slave. It is only when we try to escape from ego, that we face the great predicament, the realization that its entanglements are extremely difficult to undo. Indeed, the defeat of the deceptions of ego is one of the greatest accomplishments possible for a human being and it is synonymous with the acquisition of genuine virtue.