5 words for GRR 1–3 letters

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1 letter (2)

g r
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2 letters (2)

gr rr
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3 letters (1)

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