There are only fifty (50) Nereids, the daughters of Doris and Nereus.
Two Nereids, Thetis and Eurynome, did. Nereids are sea nymphs.
The difference between naiads and nereids is simple. Naiads are freash water spirits, while Nereids are water spirits of the sea.
in a cave
nereids
Poseidon
Nereids
Nereids, see link below for a list of names.
nymph Oceanids Nereids
Sea nymphs.
There is no one named "Nerea" in Greek mythology. The closest would be Nereus, the father of the Nereids.
Amphitrite is one, Thetis another. The whole gang is called nereids.