4 words for CM 1–2 letters

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1 letter (2)

c m
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2 letters (2)

cm mc
Archaic object pronoun
?
T
?
H
?
E
?
E
Hint 1 meaning
The objective case of thou. See Thou.
Hint 2 anagram
EEHT
Hint 3 another clue
BEING USED OR WORKED FOR THE FIRST TIME
18 +2