The headword is a feminine noun in the nominative (and vocative) singular; see LSJ s.v. o)/xqh, and cf. omicron 1045, and eta 141 (gloss).
[1] The gloss is a masculine noun in the nominative singular; see LSJ s.v., and kappa 2388. The same gloss is given for the headword by ps.-Zonaras 1492.20. (Adler also cites the unedited lexicon of Codex Laurentianus 59.16.) See also the scholia to Homer, Iliad 21.17, which indicate that it is the dative singular there that has given rise to these lemmata.