-nomy
a second element in compounds, representing Gr. -νοµία (related to νόµος law, νέµειν to distribute), occurring in words either adopted from Greek, as autonomy αὐτονοµία, economy οἰκονοµία, astronomy ἀστρονοµία, gastronomy γαστρονοµία, or formed on the analogy of these, as agronomy, geonomy, phytonomy, zoonomy.