The words below, all from Greek, have similar vocalism and fall into the same declension:
Phorkys (g. phorkynos)
Telkhis (g. telkhinos)
delphis (g. delphinos)
rhis (g. rhinos)
e-i and o-u seem to point to
Phorkys (g. phorkynos) < *pHarkun-
Telkhis (g. telkhinos) < *t(H)alkHin-
delphis (g. delphinos) < *dalpHin-
rhis < *Hrin-
I'd like find another words with this sigmatica n-declension,
Joao SL
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