From a derivative of muo (to shut the mouth); a secret or "mystery" (through the idea of silence imposed by initiation into religious rites) -- mystery.

μυστήρια (mustēria) − 4 Occurrences

μυστήριον (mustērion) − 17 Occurrences

μυστηρίου (mustēriou) − 4 Occurrences

μυστηρίῳ (mustēriō) − 2 Occurrences

μυστηρίων (mustēriōn) − 1 Occurrence