cryptic letters: crossword clues

Matching Answer
Confidence
ENCODE
60%
RUNE
48%
ENCODES
40%
TENK
20%
SECRET
20%
NSA
20%
ENIGMA
20%
ENCODED
20%
CODED
20%
ARCANE
20%
e.g. Greek Cheese
e.g. O?D (Use ? for unknown letters)