ho (Greek #3588)
the definite article; the (sometimes to be supplied, at others omitted, in English idiom)
KJV usage: the, this, that, one, he, she, it, etc.
Pronounce: ho
Origin: ἡ (hay), and the neuter τό (to) in all their inflections
o (Greek #5599)
as a sign of the vocative case, O; as a note of exclamation, oh
KJV usage: O.
Pronounce: o
Origin: a primary interjection