The Nymphai (Nymphs): generally female deities who were personifications/beings of certain types of landforms.They can be categorized as such: Celestial Nymphs, Wood Nymphs, Water Nymphs, Land Nymphs and Underworld Nymphs. Though there are a few exceptions to this: for instance, the Naides, the Muses, and such.Some nymphs were classified by their locations.They were close to the Gods of nature (Hermes, Dionysos, Artemis, Poseidon, Demeter). Usually nymphs are shown as beautiful women who dwell in the wilderness. Their numbers were infinite. They, of course, were ranked far low below Gods, Goddesses, Demigods, but they often attended meetings and activities on Olympus.
Classes of Nymphai:
Anthousai- Flower Nymphs.
Aurai- Cooling Breeze Nymphs
Bakkhai- Bacchic Nymphs
Boukolai- Same thing as Epimelides. Rustic Nymphs
Dryades- Forest Nymphs (tree nymphs, oreiades mountain nymphs, meliai ash-tree nymphs, hamadryades oak nymphs, meliades fruit tree nymphs)
Epimelides- Pasture Nymphs
Halial- Sea Nymphs (This includes the Nereides)
Heleionomai- Fresh Water & Marsh Nymphs
Krenaiai- Well Nymphs
Lampades- Torch Bearers
Leimenides- Water-Meadow Nymphs
Limnatides- Lake Nymphs
Meliades- Crazed Nymphs (often tore men/animals apart and ate them)
Melial- Honey Nymphs
Melissai- Honey Nymphs
Naiades- Usually daughters of River Gods
Nephelai- Cloud Nymphs
Nymphai- Minor spirits of nature.
Pegaiai- Spring Nymphs
Potameides- River Nymphs
Thyiades- Wild Nymphs