Greek Grammar

It is declined, such as those above.
Ho Laches. tou Lachetos. Ho Kebes. tou Kebetos.
Those ending in -es, which are iambic and do not have the -t- before the -es, form the genitive in -tos.
Ho Paris. tou Paridos. tō Paridi. ton Parida and Parin. The vocative is ō Pari. Ho Adonis. tou Adōnidos.
Nouns ending in -is that are proper names decline through -dos, such as those above, and in the Ionic style without the -d-, such as Parios, Adōnios.
Ho botrys cluster of grapes. tou botryos. Ho hēdys sweet. tou hēdeos.
Of those ending in -ys, some—such as hēdys, hēdeia, hēdy—decline through -eos. Others, which are monogenē of a single gender/unvarying, decline through -yos, except for pēchys cubit, pēcheōs; pelekys axe, pelekēōs; enchelys eel, enchèleōs. Those that decline through -ō are declined in the Attic style.
Ho hidrōs sweat. tou hidrōtos. Ho gelōs laughter. tou gelōtos.
Ho hērōs hero. tou hērōos.
For masculine nouns ending in -ōs that are barytone: those that have a short penultimate syllable decline through -tos. Those that have a long penultimate syllable decline through a pure -os. Those that are oxytones having an acute accent on the final syllable beyond one syllable decline through -ōtos.
Ho charieis graceful. tou charientos. Ho heis one. tou henos.