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are declined, except for ὁ Ἄραψ the Arab, τοῦ Ἄραβος; ὁ Λίψ the Libs/South-West wind, τοῦ Λιβός.
ὁ κίνυψ the Cinyps, τοῦ κίνυφος.
ὁ Ἀλκμάν the Alcman, τοῦ Ἀλκμᾶνος. ὁ παιάν the paean, τοῦ παιᾶνος. Nouns ending in -αν, which are acutitone and end in -α, are declined by the addition of -ος.
ὁ Ἕλλην the Greek, τοῦ Ἕλληνος. ὁ ποιμήν the shepherd, τοῦ ποιμένος. Nouns ending in -ην, which are not acutitone and do not contain the letter μ, are declined by the addition of -ος, such as ὁ σωλήν the pipe, τοῦ σωλῆνος, except for ὁ αὐχήν the neck, τοῦ αὐχένος.
Those that contain the letter μ follow the pattern of -ης, as in ποιμήν, ποιμένος, except for ὁ μήν the month, τοῦ μηνός. Those which are barytone and monogenetic having one gender have the η in the genitive, such as Ἕλλην, Ἕλληνος. Those that are neuter are declined via -ενος, such as τὸ πέριν the perin, τοῦ πέρινος.
ὁ δελφίν the dolphin, τοῦ δελφῖνος.
ὁ Φόρκυν the Phorcys, τοῦ Φόρκυνος. Nouns ending in -υν form the genitive by the addition of -ος.
ὁ λέων the lion, τοῦ λέοντος. ὁ θέων the runner, τοῦ θέωνος. ὁ Σαρπηδών the Sarpedon, τοῦ Σαρπηδόνος. ὁ Ποσειδῶν the Poseidon, τοῦ Ποσειδῶνος. ὁ Ξενοφῶν the Xenophon, τοῦ Ξενοφῶντος. ὁ Κριτών the Criton, τοῦ Κριτῶνος. ὁ ἀγών the contest, τοῦ ἀγῶνος. ὁ χειμών the winter, τοῦ χειμῶνος. Regarding nouns ending in -ων: those which are barytone and paronymous derived from another word are declined via -ωνος, such as Κικέρων Cicero, Κικέρωνος. Those which are verbal or common in gender are declined via -ονος, such as Φιλήμων Philemon, Φιλήμονος; βελτίων better, βελτίονος; σώφρων prudent, σώφρονος. Those which have feminine forms in -αινα are declined via -ντ, such as θεράπων attendant, θεράποντος, because it is θεράπαινα. Except for Λάκων Laconian, Λάκωνος, for whom there is a feminine Λάκαινα. Nouns ending in -ων that are acutitone and circumflex are declined via -ωντος, such as Ξενοφῶν, Ξενοφῶντος, except for...