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
musterion (Greek #3466)
a secret or "mystery" (through the idea of silence imposed by initiation into religious rites)
KJV usage: mystery.
Pronounce: moos-tay'-ree-on
Origin: from a derivative of μύω (to shut the mouth)